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  Subjects -> ELECTRONICS (Total: 207 journals)
Showing 1 - 200 of 277 Journals sorted by number of followers
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 313)
Control Systems     Hybrid Journal   (Followers: 253)
IEEE Transactions on Geoscience and Remote Sensing     Hybrid Journal   (Followers: 201)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 197)
Electronics     Open Access   (Followers: 138)
Advances in Electronics     Open Access   (Followers: 133)
Electronic Design     Partially Free   (Followers: 129)
Electronics For You     Partially Free   (Followers: 128)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 120)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 91)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 89)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 88)
IEEE Transactions on Software Engineering     Hybrid Journal   (Followers: 84)
IEEE Transactions on Industrial Electronics     Hybrid Journal   (Followers: 84)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 81)
IET Power Electronics     Open Access   (Followers: 70)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 67)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 63)
IEEE Embedded Systems Letters     Hybrid Journal   (Followers: 62)
IEEE Transactions on Industry Applications     Hybrid Journal   (Followers: 58)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 53)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 53)
Advances in Power Electronics     Open Access   (Followers: 49)
IEEE Nanotechnology Magazine     Hybrid Journal   (Followers: 45)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 45)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 41)
IEEE Transactions on Biomedical Engineering     Hybrid Journal   (Followers: 35)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 34)
IET Microwaves, Antennas & Propagation     Open Access   (Followers: 34)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 32)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 30)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 28)
Electronics Letters     Open Access   (Followers: 28)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 27)
Microelectronics and Solid State Electronics     Open Access   (Followers: 27)
International Journal of Power Electronics     Hybrid Journal   (Followers: 24)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 24)
Journal of Sensors     Open Access   (Followers: 23)
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 22)
IEEE Reviews in Biomedical Engineering     Hybrid Journal   (Followers: 20)
IEEE/OSA Journal of Optical Communications and Networking     Hybrid Journal   (Followers: 19)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 18)
Journal of Artificial Intelligence     Open Access   (Followers: 18)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 17)
IET Wireless Sensor Systems     Open Access   (Followers: 17)
Circuits and Systems     Open Access   (Followers: 16)
Archives of Electrical Engineering     Open Access   (Followers: 15)
International Journal of Control     Hybrid Journal   (Followers: 14)
IEEE Transactions on Signal and Information Processing over Networks     Hybrid Journal   (Followers: 14)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 14)
IEEE Women in Engineering Magazine     Hybrid Journal   (Followers: 13)
Advances in Microelectronic Engineering     Open Access   (Followers: 13)
IEEE Solid-State Circuits Magazine     Hybrid Journal   (Followers: 13)
Machine Learning with Applications     Full-text available via subscription   (Followers: 12)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 12)
IEEE Transactions on Broadcasting     Hybrid Journal   (Followers: 12)
IEEE Transactions on Learning Technologies     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 11)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 11)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 11)
International Journal of Advanced Electronics and Communication Systems     Open Access   (Followers: 11)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 11)
Open Journal of Antennas and Propagation     Open Access   (Followers: 10)
Solid-State Electronics     Hybrid Journal   (Followers: 10)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 10)
IETE Journal of Research     Open Access   (Followers: 10)
Batteries     Open Access   (Followers: 9)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 9)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 9)
IETE Technical Review     Open Access   (Followers: 9)
Nature Electronics     Hybrid Journal   (Followers: 9)
Journal of Signal and Information Processing     Open Access   (Followers: 9)
APSIPA Transactions on Signal and Information Processing     Open Access   (Followers: 8)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 8)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 8)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 8)
China Communications     Full-text available via subscription   (Followers: 8)
Superconductivity     Full-text available via subscription   (Followers: 8)
IEEE Transactions on Autonomous Mental Development     Hybrid Journal   (Followers: 8)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 8)
International Journal of Antennas and Propagation     Open Access   (Followers: 8)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 8)
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 8)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 7)
Power Electronic Devices and Components     Open Access   (Followers: 7)
Foundations and Trends® in Signal Processing     Full-text available via subscription   (Followers: 7)
Nanotechnology, Science and Applications     Open Access   (Followers: 7)
IEEE Magnetics Letters     Hybrid Journal   (Followers: 7)
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Metrology and Measurement Systems     Open Access   (Followers: 6)
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 6)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 6)
Kinetik : Game Technology, Information System, Computer Network, Computing, Electronics, and Control     Open Access   (Followers: 6)
International Journal of Electronics     Hybrid Journal   (Followers: 6)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 6)
Research & Reviews : Journal of Embedded System & Applications     Full-text available via subscription   (Followers: 6)
Journal of Power Electronics     Hybrid Journal   (Followers: 6)
Annals of Telecommunications     Hybrid Journal   (Followers: 6)
Electronic Markets     Hybrid Journal   (Followers: 6)
Energy Storage Materials     Full-text available via subscription   (Followers: 6)
IEEE Transactions on Services Computing     Hybrid Journal   (Followers: 5)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 5)
Journal of Optoelectronics Engineering     Open Access   (Followers: 5)
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 5)
Journal of Field Robotics     Hybrid Journal   (Followers: 5)
Journal of Electronics (China)     Hybrid Journal   (Followers: 5)
Batteries & Supercaps     Hybrid Journal   (Followers: 5)
IEEE Pulse     Hybrid Journal   (Followers: 5)
Journal of Microelectronics and Electronic Packaging     Hybrid Journal   (Followers: 4)
Networks: an International Journal     Hybrid Journal   (Followers: 4)
EPE Journal : European Power Electronics and Drives     Hybrid Journal   (Followers: 4)
Advanced Materials Technologies     Hybrid Journal   (Followers: 4)
Frontiers in Electronics     Open Access   (Followers: 4)
Wireless and Mobile Technologies     Open Access   (Followers: 4)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 4)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
IEEE Transactions on Haptics     Hybrid Journal   (Followers: 4)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 4)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 4)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 4)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 4)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Informatik-Spektrum     Hybrid Journal   (Followers: 3)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 3)
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 3)
Advancing Microelectronics     Hybrid Journal   (Followers: 3)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 3)
IETE Journal of Education     Open Access   (Followers: 3)
Superconductor Science and Technology     Hybrid Journal   (Followers: 3)
Sensors International     Open Access   (Followers: 3)
e-Prime : Advances in Electrical Engineering, Electronics and Energy     Open Access   (Followers: 3)
EPJ Quantum Technology     Open Access   (Followers: 3)
Frontiers of Optoelectronics     Hybrid Journal   (Followers: 3)
Transactions on Electrical and Electronic Materials     Hybrid Journal   (Followers: 2)
ACS Applied Electronic Materials     Open Access   (Followers: 2)
IET Smart Grid     Open Access   (Followers: 2)
Energy Storage     Hybrid Journal   (Followers: 2)
Journal of Microwave Power and Electromagnetic Energy     Hybrid Journal   (Followers: 2)
Australian Journal of Electrical and Electronics Engineering     Hybrid Journal   (Followers: 2)
Journal of Information and Telecommunication     Open Access   (Followers: 2)
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 2)
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 2)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Journal of Nuclear Cardiology     Hybrid Journal   (Followers: 2)
ECTI Transactions on Electrical Engineering, Electronics, and Communications     Open Access   (Followers: 1)
IET Energy Systems Integration     Open Access   (Followers: 1)
Majalah Ilmiah Teknologi Elektro : Journal of Electrical Technology     Open Access   (Followers: 1)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 1)
IEEE Letters on Electromagnetic Compatibility Practice and Applications     Hybrid Journal   (Followers: 1)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Електротехніка і Електромеханіка     Open Access   (Followers: 1)
Open Electrical & Electronic Engineering Journal     Open Access   (Followers: 1)
IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology     Hybrid Journal   (Followers: 1)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Transactions on Cryptographic Hardware and Embedded Systems     Open Access   (Followers: 1)
International Journal of Hybrid Intelligence     Hybrid Journal   (Followers: 1)
Ural Radio Engineering Journal     Open Access   (Followers: 1)
IET Cyber-Physical Systems : Theory & Applications     Open Access   (Followers: 1)
Edu Elektrika Journal     Open Access   (Followers: 1)
Power Electronics and Drives     Open Access   (Followers: 1)
Automatika : Journal for Control, Measurement, Electronics, Computing and Communications     Open Access  
npj Flexible Electronics     Open Access  
Elektronika ir Elektortechnika     Open Access  
Emitor : Jurnal Teknik Elektro     Open Access  
IEEE Solid-State Circuits Letters     Hybrid Journal  
IEEE Open Journal of Industry Applications     Open Access  
IEEE Open Journal of the Industrial Electronics Society     Open Access  
IEEE Open Journal of Circuits and Systems     Open Access  
Journal of Electronic Science and Technology     Open Access  
Solid State Electronics Letters     Open Access  
Industrial Technology Research Journal Phranakhon Rajabhat University     Open Access  
Journal of Engineered Fibers and Fabrics     Open Access  
Jurnal Teknologi Elektro     Open Access  
IET Nanodielectrics     Open Access  
Elkha : Jurnal Teknik Elektro     Open Access  
JAREE (Journal on Advanced Research in Electrical Engineering)     Open Access  
Jurnal Teknik Elektro     Open Access  
IACR Transactions on Symmetric Cryptology     Open Access  
Acta Electronica Malaysia     Open Access  
Bioelectronics in Medicine     Hybrid Journal  
Chinese Journal of Electronics     Open Access  
Problemy Peredachi Informatsii     Full-text available via subscription  
Technical Report Electronics and Computer Engineering     Open Access  
Jurnal Rekayasa Elektrika     Open Access  
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Visión Electrónica : algo más que un estado sólido     Open Access  
Telematique     Open Access  
International Journal of Nanoscience     Hybrid Journal  
International Journal of High Speed Electronics and Systems     Hybrid Journal  
Semiconductors and Semimetals     Full-text available via subscription  

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Similar Journals
Journal Cover
IEEE Magnetics Letters
Journal Prestige (SJR): 0.532
Citation Impact (citeScore): 2
Number of Followers: 7  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1949-307X
Published by IEEE Homepage  [228 journals]
  • Simulation of Electromagnetic Wave Propagation in Magnetic Randomly
           Inhomogeneous Magnetic Media

    • Free pre-print version: Loading...

      Authors: Pavel Makarov;Vladimir Ustyugov;Leonid Kotov;Sergey Nekipelov;Viktor Sivkov;
      Pages: 1 - 5
      Abstract: This letter presents an algorithm for numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the finite differences in the time domain (FDTD) method. The algorithm is suitable for analyzing the main timing characteristics, as well as for identifying the features of the propagation of various types of signals in both time-independent and time-dependent, layered, randomly inhomogeneous media. Simulation was carried out of the propagation of the sine pulse, sine signal, and square wave in time-independent magnetic randomly inhomogeneous media with various levels of phase contrast of two types: with a “diffuse” distribution of inhomogeneities and their “close packing.” The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Magnetic Field Leakage Cancellation in Multiple-Input Multiple-Output
           Wireless Power Transfer Systems

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      Authors: Daisuke Kobuchi;Kentaro Matsuura;Yoshiaki Narusue;Hiroyuki Morikawa;
      Pages: 1 - 4
      Abstract: This letter presents a method to cancel magnetic field leakage while maintaining high power transfer efficiency (PTE) in multiple-input multiple-output wireless power transfer systems. To achieve low leakage and high PTE, the problem of PTE maximization under the cancellation condition of the magnetic field leakage is solved, which is a maximization problem of affinely constrained Rayleigh quotients. Subsequently, the optimal amplitudes and phases of the input voltages at the transmitter array and the optimal load impedances at the receivers are shown. This method can further reduce the magnetic field leakage by up to 31 dB compared with the PTE maximization method, while having a PTE drop within 5.5%.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • A Technological Approach for Miniaturization of Three-Dimensional
           Inductive Levitation Microsuspensions

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      Authors: Emil R. Mamleyev;Achim Voigt;Ali Moazenzadeh;Jan G. Korvink;Manfred Kohl;Kirill Poletkin;
      Pages: 1 - 4
      Abstract: In this letter, we report on a technological approach for miniaturization of a inductive levitating microsuspension based on nested three-dimensional (3-D) microcoil structures. In the developed approach, each 3-D microcoil is fabricated separately, beginning with the innermost and thus the smallest coil diameter of the nested microstructure. This helps to overcome fabrication restrictions due to the wire-bonding process and is primarily caused by the size of the bond-head and provides the opportunity to fabricate smaller nested 3-D microcoil structures. We fabricated a nested two-microcoil structure, the inner coil having a diameter of 1000 $mu$m and 14 windings, the outer coil with a diameter of 1900 $mu$m and eight windings, and demonstrated its application as an inductive levitating microsuspension. In particular, a fabricated 3-D inductive levitating microsuspension was able to levitate a 1100 $mu$m diameter disc-shaped proof mass at a height up to 45 $mu$m.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Simulation of Magnetic Resonance Sounding With a Delayed Adiabatic Pulse

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      Authors: Benquan Yang;Yujing Yang;
      Pages: 1 - 5
      Abstract: Magnetic resonance sounding (MRS) is used to identify groundwater by exciting and measuring the nuclear magnetic resonance of hydrogen nuclei in subsurface aquifers. However, the MRS response is particularly weak and has a low signal-to-noise ratio (SNR); therefore, signal enhancement methods, such as adiabatic pulses, are essential for MRS applications with strong interference. The key challenges of utilizing this novel method are to increase the MRS signal response and sensitivity for field measurements. In this letter, we present an improved transmitting mode of a commonly used adiabatic half-passage pulse by combining this pulse with an earlier fixed frequency off-resonant pulse of short duration, thereby increasing the theoretical MRS sensitivity. Simulation results demonstrate that the approach could be used to further improve the signal responses, i.e., in terms of the SNR and potential resolution, for MRS exploration of high-noise environments.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Comparison of Two Approaches for Microstructural Modeling of the
           Ferromagnetic Alloys Behavior

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      Authors: Anatoli A. Rogovoy;Olga S. Stolbova;
      Pages: 1 - 4
      Abstract: In this letter, two approaches to describe the behavior of a ferromagnetic alloy in an external magnetic field within the framework of the micromagnetism theory are compared. The first one is based on the minimization of total magnetic energy. Another approach is based on describing the dynamics of the process using the Landau–Lifshitz–Gilbert equation. We have considered the problems of magnetization of a single martensite variant of the Ni2MnGa alloy within the framework of the theory of magnetism, in which one of the structural elements is a domain wall of a certain thickness, using bothapproaches. The solutions to these boundary value problems were obtained numerically by the finite-element method using the FeniCS package. The evolution of the magnetic structure was investigated. Magnetization curves were obtained in the external magnetic field directed at different angles to the anisotropy axis.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Novel Diagnostic of Steel Wire Rope With Passive Magnetic Methods

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      Authors: Paweł Mazurek;Maciej Roskosz;Jerzy Kwaśniewski;
      Pages: 1 - 5
      Abstract: Steel wire ropes in every device, such as lifts, cableways, and hoists used in roped transport devices, are subject to fatigue and cracks. The problem of determining the exact technical condition of the tested wire rope depends on many factors. In this letter, the authors present a novel diagnostic procedure of steel wire rope with passive magnetic methods. This letter examines a new fabric rope and then the same rope with an artificially introduced discontinuity. Based on the research, the authors discuss the magnetic passive technique's future use for nondestructive damage detection methods for steel wire ropes.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Mutual Orientation of Electric Intracrystalline and Magnetic Fields in
           Iron Borate Single Crystals

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      Authors: Nikita Snegirev;Ekaterina Smirnova;Igor Lyubutin;Airat Kiiamov;Sergey Starchikov;Sergey Yagupov;Mark Strugatsky;Olga Alekseeva;
      Pages: 1 - 4
      Abstract: X-ray structural analysis, Mössbauer spectroscopy, and ab initio calculations are used to study the structural properties and refine the orientation of intracrystalline fields in FeBO3 crystals in the region of the magnetic phase transition. It is found that in the temperature range of 293–403 K, the trigonal lattice parameters increase monotonically. Analysis of the electron density distribution maps does not show visible local disordering over the entire investigated temperature range. It is found that iron borate has an axially symmetric electric field gradient (EFG) whose main axis is directed along [001]. This orientation is maintained above and below the Néel point. In the magnetically ordered state of the crystal, the main axis of the EFG is orthogonal to the direction of the hyperfine magnetic field at iron nuclei. The results obtained will be used to develop a theoretical model of the formation of hyperfine structure in iron borate, which is important for applications of such crystals in next-generation synchrotron technologies.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • An Estimation of Magnetic Properties of Existing and Prospective Atomic
           Chains in the Framework of the Heisenberg Model

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      Authors: Sergey Kolesnikov;Ekaterina Sapronova;
      Pages: 1 - 5
      Abstract: In this letter, we use an analytical method for the estimation of magnetic properties of a wide range of ferromagnetic and antiferromagnetic single-atomic and biatomic chains.It is found that biatomic chains can be used as a bit of information at higher temperatures than temperatures for the same single-atomic chains. At the same time, the ratio between the spontaneous and induced remagnetization times is lower in the case of biatomic chains. According to our analysis, Co chains on a Rh(553) surface seem the most conducive to the creation of stable bits of information. The effects of nitriding the substrate or oxidation of the atomic chain are discussed. An analysis of magnetodynamic properties of ferromagnetic chains shows that the usage of atomic chains gives an opportunity to construct magnetic materials with a wide range of physical properties.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Effect of Structure and Electron Configuration on the Magnetic Properties
           of La0.7Ca0.3– x Sr x Mn0.95Al0.05O3 Manganites

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      Authors: Alexander Ulyanov;Dmitrii Tupitsyn;Alexander Vasiliev;Serguei Savilov;
      Pages: 1 - 3
      Abstract: La0.7Ca$_{0.3-x}$Sr$_{x}$Mn0.95Al0.05O3 manganites doped in A and B positions of a perovskite ABO3 cell are studied in this letter. Replacing Mn3+ by Al3+ decreases the density of itinerant $e_{mathrm g}$ electrons. It weakens the double exchange and decreases the Curie temperature ($T_{mathrm C}$). Continuous substitution of Ca2+ ion with larger Sr2+ ion leads to increase of average and local crystal structure parameters of the perovskites and causes an increase in $T_{mathrm C}$. Change of electron configuration, due to the substitution of Mn3+ by Al3+, affects the $T_{mathrm C}$ more than does the change in local structure, caused by the substitution of Ca2+ by Sr2+. It leads to a decrease in $T_{mathrm C}$ in general despite some increase in $T_{mathrm C}$ caused by the smaller Al3+ ionic radius than that of Mn3+.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Magnetic Composite Coatings FeC and NiC Synthesized With Arabinogalactan

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      Authors: Sergey V. Stolyar;Irina G. Vazhenina;Roman N. Yaroslavtsev;Lidia A. Chekanova;Elena V. Cheremiskina;Yuri L. Mikhlin;
      Pages: 1 - 5
      Abstract: In this work, we investigated the ferromagnetic resonance spectra of metal/carbon composite coatings. FeC and NiC coatings were synthesized by electroless deposition using polysaccharide arabinogalactan. An analysis of the angular dependences of the resonance field showed that the coatings consist of three magnetic phases separated by a nonmagnetic phase of carbon.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Construction of Energy Loops Using Magnetic Barkhausen Noise

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      Authors: Xiaoge Meng;Lin Li;Yanzhao Hou;
      Pages: 1 - 5
      Abstract: Magnetic Barkhausen noise (MBN), which contains microstructure information of materials, is widely used in nondestructive testing (NDT) of magnetic materials. MBN energy (MBNenergy) is a time-independent indicator for NDT, but the initial MBNenergy has no clear physical meaning and cannot be used to explain the relationship to the hysteresis loop. In this letter, based on the physical mechanism of MBN, a proportional relation is built between the MBN voltage signal VB and energy loss, and the signal VB is then related to the energy loss through wall pinning in the Jiles–Atherton hysteresis model. We define a novel magnetic Barkhausen noise energy eigenvalue (MBNE) as the time integral of the product of the absolute value of VB and the sign function sign(dH/dt). We prove that the MBNE is proportional to the irreversible magnetization Mirr. Since Mirr is equal to the saturation magnetization Ms when the magnetization of ferromagnetic material reaches saturation, we scaled the MBNE to make its maximum value equal to Ms and found that MBNE with respect to the magnetic field H, MBNE(H), coincides with the irreversible hysteresis loop Mirr(H). We refer to MBNE(H) as the MBN energy loop. The MBNE(H) and Mirr(H) for two kinds of electrical steel sheets are compared experimentally, which validates the adaptability of the MBNE(H) construction method. The method to obtain Mirr(H) from the MBN raw signal reveals the physical mechanism of MBN and the irreversib-e magnetization process of magnetic materials.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • High-Field Magnetization Study of Laves Phase (Gd,Y,Sm)Fe2-H

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      Authors: Irina S. Tereshina;Denis I. Gorbunov;Alexei Yu. Karpenkov;Mathias Doerr;Henryk Drulis;Sergey A. Granovski;Evgenia A. Tereshina-Chitrova;
      Pages: 1 - 5
      Abstract: The crystal structure and magnetic properties of the multicomponent Laves phase compounds (Gd1-xYx)0.8Sm0.2Fe2Hz ($boldsymbol{x}$ = 0, 0.2, 0.4, 0.6, 0.8, 1; $boldsymbol{z}$ = 0 and 3.4) are investigated. These compounds crystallize into an MgCu2 type of structure. Hydrogenation does not change the crystal structure type but boosts the unit cell volume of (Gd,Y,Sm)Fe2 by ∼25%. Both parent and the hydrogen-charged ferrimagnetic compounds demonstrate magnetic compensation (mutual cancellation of magnetic moments of the individual magnetic sublattices). The exact compositions with zero magnetization state (compensated compositions) predicted using a three-sublattice model are in good agreement with the experiment. In the hydrides, the magnetic compensation takes place at a lower Y content as compared to the parent alloys. Pulsed magnetic fields reveal a distinctly different behavior of magnetization in the hydrides. With the increase of magnetic field, magnetization increases much faster in the hydrides as compared to the parent compounds.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Time-Varying Magnetic Field to Enhance the Navigation of Magnetic
           Microparticles in a Bifurcated Channel

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      Authors: Pralay Chakrabarty;Roy P. Paily;
      Pages: 1 - 5
      Abstract: This letter investigates the navigation of magnetic microparticles (MMPs) in a Y-shaped microfluidic channel under the influence of an external magnetic field. The external magnetic field exerts a magnetic force on the magnetizable MMPs to steer them from the bifurcation point to the desired channel. During this process, some MMPs aggregate and stick to the channel walls, thus reducing the efficacy of the navigation process. To mitigate this problem, a time-varying magnetic field (TVMF) is applied for efficient navigation of the MMPs in the channel. The TVMF alternately switches between two modes of operation described as follows. In the first mode of operation, the TVMF is applied for a certain time duration to generate the magnetic force required for steering the MMPs to the desired outlet. The second mode of operation facilitates mitigation of the stiction and aggregation of MMPs by modulating the TVMF and time duration of operation, so as to yield a lower magnetic force in the reverse direction to that in the first mode. Extensive simulations are performed to analyze the switching time for effective steering of the MMPs using COMSOL Multiphysics. Results illustrate that the time duration between the two modes of operation should be set using a ratio of 3$:$1 for effective guidance of the MMPs to the correct outlet.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Safety Assessment of H-Coil for Nursing Staff in Deep Transcranial
           Magnetic Stimulation

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      Authors: Mai Lu;Shoogo Ueno;
      Pages: 1 - 5
      Abstract: This work investigates the exposure experienced by the nursing staff executing deep transcranial magnetic stimulations (TMS) using H-coil. The safety assessment was implemented by employing the H-coil and realistic human model. The 144 relative positions of the H-coil with respect to the TMS operator body were considered, including the distance and vertical height. Dependence of the magnetic flux density and induced electric fields in the human model were obtained by using the impedance method. Results were compared with the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines. Regarding the occupational exposure, safe distances of 120 and 100 cm are derived from the ICNIRP reference level (RL) and basic restriction (BR), respectively. At the distance of 100 cm, the exposure level does not exceed the ICNIRP BR, and although the exposure level exceeds the RL, continued exposure is allowed. The findings suggest that nursing staff should stand at least 100 cm apart from the H-coil.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Development of a Temperature Sensor Using Spin-Crossover
           Fe(pyrazine)[Pt(CN)4I] Nanoparticles

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      Authors: Yunji Eom;Keonmok Kim;Hyeon-Jun Lee;Sri Ramulu Torati;CheolGi Kim;
      Pages: 1 - 5
      Abstract: Device miniaturization requires temperature sensors with high resolution and precise calibration for measurements at reduced scale. We developed an optical temperature sensor using Fe2+ spin-crossover (SCO) material that has low and high spin states depending on temperature. We adjusted the operating range of the SCO (295–365 K) with an appropriate concentration of iodine. The color induced by temperature change was observed with a microscope and was converted to the color intensity represented in grayscale. To test the material, we covered the surface of a gold microheater with a layer of Fe(pyrazine)[Pt(CN)4I] SCO nanoparticles and compared optically measured temperatures with those from a conventional temperature sensor. We conclude that the thermochromic temperature sensor is suitable for measuring temperature changes in microdevices, even in ambient light.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Two Modes of Drag Reduction for Magnetorheological Fluids

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      Authors: Jing Cheng Lv;Ming Yu Wu;Tong Zhao;Yin Tao Wei;
      Pages: 1 - 5
      Abstract: Magnetorheological fluids (MRFs) show a millisecond-level reversible response controlled by an external magnetic field and are, thus, widely used in many areas, especially vehicle dampers, clutches, and brakes. However, in the standby state, the piston or rotor of these devices still moves in the MRF and generates damping force or torque, which will deteriorate the performance and even significantly increase the energy consumption of the entire vehicle. To solve these problems, we propose two working modes of MRFs based on rheology: vertical shear and parallel shear modes. We designed relevant magnetic circuit implementations for drum-type rotary magnetorheological (MR) devices to realize these new modes and verified the drag reduction effects by using a modified rheometer. The experimental results indicate that the vertical shear and parallel shear modes reduce the drag torque of the MRF by approximately 10% and 9% at magnetic field strengths of approximately 3.5 and 0.1 kA/m, respectively. Therefore, MR devices utilizing these drag reduction modes can reduce standby damping to improve performance. In addition, two mechanisms were developed to explain the significant decrease in damping torque with the increasing number of experiments under the vertical shear mode. In summary, research into these two modes promotes understanding of MRFs and the development of MR devices.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Torsion Mode of the Magneto-Electric Effect in a Metglas/GaAs
           Layered Structure

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      Authors: Mirza I. Bichurin;Oleg V. Sokolov;Vyacheslav N. Lobekin;
      Pages: 1 - 4
      Abstract: This letter is devoted to the theoretical study of the magneto-electric (ME) effect in the magnetostrictive piezoelectric semiconductor structure of Metglas–gallium arsenide (GaAs) in torsion mode. Earlier, it was found that the ME effect significantly increases when passing from the low-frequency range to the region of electromechanical resonance (EMR). There are known results on the study of the ME effect in the range of different EMR modes: planar, flexural, and shear. In this letter, we consider the ME effect in the torsional mode region in a two-layer Metglas/GaAs composite. Interest in this phenomenon is associated both with the study of the new effect and with the possibility of studying the ME effect in the region of magneto-acoustic resonance, i.e., when the torsional mode coincides with the spin wave in the region of ferromagnetic resonance. The results obtained can find application in the design of new ME devices.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Precession Frequency and Switching Time of the Magnetization Vector in the
           Spin-Valve Active Layer With Perpendicular Anisotropy

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      Authors: Iuliia Alexandrovna Iusipova;
      Pages: 1 - 5
      Abstract: In this letter, the dynamics of the magnetization vector of a free layer of a spin-valve structure with perpendicular layers anisotropy is simulated. Arbitrary direction of the applied magnetic field is considered. The critical characteristics of the switching and precession of the vector magnetization for the read head of the hard disk, magnetoresistive random-access memory, spin-transfer nano-oscillator, spin-valve biosensors, and the stochastic neuron p-bit used to implement probabilistic spin logic are calculated. Among ten ferromagnetic materials (hardmagnetic alloys Co50Pt50, Fe50Pt50, Fe50Pd50, Fe50Ni50, and softmagnetic materials such as cobalt, iron, Fe70Co30, Fe60Co20B20, Co93Gd7, and Co80Gd20), the most promising for the manufacture of these devices were selected.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Magnetic Full Adder Based on Negative Differential Resistance-Enhanced
           Anomalous Hall Effect

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      Authors: Ziyao Lu;Hongming Mou;Yuchen Pu;Yan Wen;Xixiang Zhang;Xiaozhong Zhang;
      Pages: 1 - 5
      Abstract: Spintronic logic devices have attracted attention because of the prospect of breaking the von Neumann bottleneck through nonvolatile in-memory computing. Although varieties of spin Boolean logic gates have been proposed, spintronic arithmetic logic units such as adders have not been extensively studied because of the difficulties in application of the cascade method of CMOS-based logic in spintronic devices. We experimentally demonstrated a spintronic full adder based on the anomalous Hall effect and geometrical tuning magnetization switching driven by spin-orbit torque. The anomalous Hall effect of magnetic bits was enhanced by nonlinear elements with N-type negative differential resistance to control the on/off state of mosfets, which determined the write voltage of the memory unit. The magnetizations of the memory bits in the memory unit were switched one by one as write voltage increased because of geometry difference. The order of magnetization switching caused the response of the anomalous Hall voltage of the memory unit to the input configurations to conform with the logic function of the full adder. The computation function of the full adder combined with memory writing was experimentally realized with only seven magnetic bits and two steps. The reduced number of magnetic bits and time steps indicated the efficiency of space and time of our device, which is beneficial for practical applications.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Toward Efficient Logic-in-Memory Computing With Magnetic Reconfigurable
           Logic Circuits

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      Authors: Farzad Razi;Mohammad Hossein Moaiyeri;Siamak Mohammadi;
      Pages: 1 - 5
      Abstract: Logic-in-memory (LIM) structures are promising candidates to obviate limitations of the conventional von Neumann architecture, especially in big data applications, such as image processing. In this paradigm, simple logic operations are embedded in memory to perform basic processes and consequently decrease the workload of the main processor. This letter presents an efficient hybrid fin field-effect transistor and magnetic tunnel junction (MTJ) logic structure compatible with all kinds of memory and which performs nor/or and nand/and operations. The design utilizes MTJs to obtain different voltage levels and two sense amplifiers to generate the outputs. Simulation results assert that the design improves the delay and power by 33% and 20%, respectively, compared to its state-of-the-art counterparts. Moreover, the magnetic LIM structure is appropriately utilized in image processing applications, such as minimum and maximum image filters, for preparing intermediate data. In the case study, high-level simulations indicate that the design reduces the delay and power by 31% and 21%, respectively.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • MESO Neuron: A Low-Power and Ultrafast Spin Neuron for Neuromorphic
           Computing

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      Authors: Junwei Zeng;Yabo Chen;Jiahao Liu;Chenglong Huang;Nuo Xu;Cheng Li;Liang Fang;
      Pages: 1 - 5
      Abstract: In this letter, a low-power and ultrafast spin neuron for mimicking biological neurons based on magneto-electric spin-orbit (MESO) neurons is presented. First, the physical model of a MESO neuron based on the Landau–Lifshitz–Gilbert (LLG) equation at room temperature is built for investigating the characteristics. By utilizing these characteristics of the MESO device, a current pulse is used to induce the stochastic switching behaviors. We successfully mimic the behavior of the biological neuron with single activation time down to 0.8 ns. Second, using model-derived device parameters, we further simulate a three-layer fully connected neural network using MESO neurons. Using the Mixed National Institute of Standards and Technology database handwritten pattern dataset, our system achieves a recognition accuracy of 98%. In addition, the influence of pulsewidth and amplitude on activation functions of MESO neurons is researched using HSPICE tools. The results show that as pulsewidth and amplitude are increasing, the power consumption and computing time increase while the energy consumption decreases. Specifically, the power consumption performance of a MESO neuron is about 10 µW and improved approximately three orders of magnitude compared to a 45 nm CMOS neuron.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Gaussian Random Number Generator With Reconfigurable Mean and Variance
           Using Stochastic Magnetic Tunnel Junctions

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      Authors: Punyashloka Debashis;Hai Li;Dmitri Nikonov;Ian Young;
      Pages: 1 - 5
      Abstract: Generating high-quality random numbers with a Gaussian probability distribution function is an important and resource-consuming computational task for many applications in the fields of machine learning and Monte Carlo algorithms. Recently, complementary metal–oxide–semiconductor (CMOS)-based digital hardware architectures have been explored as specialized Gaussian random-number generators (GRNGs). These CMOS-based GRNGs have a large area and require entropy sources at their input that increase the computing cost. In this letter we present a GRNG that works on the principle of the Boltzmann law in a physical system made from an interconnected network of thermally unstable magnetic tunnel junctions. The presented hardware can produce multibit Gaussian random numbers at gigahertz speed and can be configured to generate distributions with a desired mean and variance. An analytical derivation of the required interconnection and bias strengths is provided, followed by numerical simulations to demonstrate the functionalities of the GRNG.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Large Anomalous Nernst Angle in Co2MnGa Thin Film

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      Authors: Junfeng Hu;Yao Zhang;Xiayu Huo;Ningsheng Li;Song Liu;Dapeng Yu;Jean-Philippe Ansermet;Simon Granville;Haiming Yu;
      Pages: 1 - 5
      Abstract: The new trends for anomalous Nernst effect (ANE)-based thermoelectric devices require materials with large ANE values to realize the scalable generation of voltage. Recently, very large ANE values have been observed in single crystals of some novel magnetic materials. However, to allow work to proceed on developing ANE-based devices, these materials need to be produced in thin-film form, and to date, thin films have not achieved the same large ANE values as bulk materials. In this letter, we report a large ANE in a 50 nm thick film of ferromagnetic Heusler alloy Co2MnGa, matching the values achieved in the bulk material. By systematically mapping the thermoelectric transport properties, we extracted an anomalous Nernst angle in the range of 11.5% –14.2% at 300 K.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Logical and Physical Reversibility of Conservative Skyrmion Logic

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      Authors: Xuan Hu;Benjamin W. Walker;Felipe García-Sánchez;Alexander J. Edwards;Peng Zhou;Jean Anne C. Incorvia;Alexandru Paler;Michael P. Frank;Joseph S. Friedman;
      Pages: 1 - 10
      Abstract: Magnetic skyrmions are nanoscale whirls of magnetism that can be propagated with electrical currents. The repulsion between skyrmions inspires their use for reversible computing based on the elastic billiard ball collisions proposed for conservative logic in 1982. In this letter, we evaluate the logical and physical reversibility of this skyrmion logic paradigm, as well as the limitations that must be addressed before dissipation-free computation can be realized.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Novel Radiation Hardened Magnetic Full Adder Using Spin-Orbit Torque for
           Multinode Upset

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      Authors: Alok Kumar Shukla;Arshid Nisar;Seema Dhull;Brajesh Kumar Kaushik;
      Pages: 1 - 5
      Abstract: Spintronic-based integrated circuits have been extensively explored as viable contenders for space use since magnetic tunnel junctions (MTJs) are intrinsically immune to radiation effects. On the other hand, their complementary metal–oxide semiconductor (CMOS) peripheral circuitry is still susceptible to radiation-induced single-event upset (SEU) and multinode upset (MNU) caused by charge sharing. It results in localized ionization and flips the data state of memory cells or other logic circuits. To ensure a fault-free operation, this letter proposes a novel radiation-hardened (RH) CMOS peripheral circuitry for a magnetic full adder (MFA) using spin-orbit torque MTJs. The circuit can recover from SEUs as well as MNUs regardless of the accumulated charge. Moreover, the read time and read energy of the circuit are improved by 17.6% and 64%, respectively, when compared to the previously reported RH MFA.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Theoretical Circuit Design of an Efficient Spintronic Random Number
           Generator With an Internal Postprocessing Unit

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      Authors: Saeed Mehri;Abdolah Amirany;Mohammad Hossein Moaiyeri;Kian Jafari;
      Pages: 1 - 5
      Abstract: In this letter, a spintronic true random number generator (TRNG) is designed using the stochastic switching feature of the magnetic tunnel junction device in the subcritical current regime. The proposed structure consumes low power and occupies a small area. Also, to improve the quality of random numbers production and compensate for the impact of process variations on the quality of the random output, the proposed TRNG includes an internal postprocessing unit. Compared to state-of-the-art designs, using an internal postprocessing unit reduces the proposed generator's area overhead and power consumption. The simulation results show that the TRNG proposed in this letter consumes up to 68% less power and occupies up to 64% smaller area than the state-of-the-art design. Also, due to the existence of the efficient postprocessing unit, the proposed TRNG successfully passes the National Institute of Standards and Technology random number tests even in the presence of the fabrication process variations.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Robustness of Binary Stochastic Neurons Implemented With Low Barrier
           Nanomagnets Made of Dilute Magnetic Semiconductors

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      Authors: Rahnuma Rahman;Supriyo Bandyopadhyay;
      Pages: 1 - 4
      Abstract: Binary stochastic neurons (BSNs) are excellent hardware accelerators for machine learning. A popular platform for implementing them is low- or zero-energy barrier nanomagnets possessing in-plane magnetic anisotropy (e.g., circular disks or quasi-elliptical disks with very small eccentricity). Unfortunately, small geometric variations in the lateral shapes of such nanomagnets can produce large changes in the BSN response times if the nanomagnets are made of common metallic ferromagnets (Co, Ni, Fe) with large saturation magnetization. In addition, the response times become very sensitive to initial conditions, i.e., the initial magnetization orientation. In this letter, we show that if the nanomagnets are made of dilute magnetic semiconductors with much smaller saturation magnetization than common metallic ferromagnets, then the variability in their response times (due to shape variations and variation in the initial condition) is drastically suppressed. This significantly reduces the device-to-device variation, which is a serious challenge for large-scale neuromorphic systems. A simple material choice can, therefore, alleviate one of the most aggravating problems in probabilistic computing with nanomagnets.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Synthesis and Magnetic Properties of Co Nanowires/PVDF Composites

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      Authors: Anastasiia Dryagina;Nikita Kulesh;Vladimir Olegovich Vas'kovskiy;Evgeniy Patrakov;
      Pages: 1 - 4
      Abstract: Nanocomposite materials consisting of polymer and metallic nanowires (NWs) are promising candidates for numerous applications, including sensors, flexible electronics, and optical systems. Magnetic NWs combined with polyvinylidene trifluoroethylene (PVDF) polymer are one of the most intriguing combinations due to the possibility of realizing magnetoelectric properties with very strong mechanical coupling between piezoelectric and magnetostrictive phases. However, the studies of such compounds are rare, and the synthesis process is relatively complex and expensive, which limits their testing for real-life applications. In this letter, we simplify and optimize the synthesis process, so the precursor mixture of magnetic NWs and PVDF can be obtained both easily and in large quantity. The possibility of ordering NWs in PVDF by applying a strong magnetic field during solidification is demonstrated. As a result, an ordered Co NW/PVDF nanocomposite was successfully synthesized using scalable laboratory technology, which could also be transferred to other polymer/metallic NW systems.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Simulation of Shape and Structure Response of Nonspherical
           Magnetosensitive Vesicles Subjected to Magnetic Fields

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      Authors: Aleksandr V. Ryzhkov;Yuriy L. Raikher;
      Pages: 1 - 5
      Abstract: Molecular dynamics simulation is performed to study the coupled magnetic, structural, and mechanical response of magnetosensitive vesicles to quasi-static on/off switching of an external magnetic field. The vesicle membrane filled with magnetic nanoparticles is modeled in a coarse-grained bead-spring representation. In detail, it is shown how discocyte- and stomatocyte-like vesicles respond to the uniform magnetic field. Notably, having undergone an on/off switching cycle, a vesicle does not always restore in full its shape.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Emergence of Magnetic Transition in Cobalt Oxide Nanowires on Vicinal Pt
           Substrate

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      Authors: Kseniya Tsysar;Yaroslav Koshelev;Dmitry I. Bazhanov;Ekaterina Smelova;
      Pages: 1 - 5
      Abstract: This letter is devoted to a theoretical study of the magnetic properties of supported pure and oxidized Co nanowires (NWs) on the vicinal surface of a Pt substrate. The main goal is to study the influence of oxygen on the magnetic properties of Co NWs. Transition metal atoms are magnetic, and oxygen effectively interacts with electromagnetic (EM) radiation in the optical range. Thus, by choosing the resonant frequency, it becomes possible to change the magnetic properties of oxide NW as a whole and switch the magnetic state of the wire by using an EM field. Our study has shown that Co oxide (CoO) NWs can exhibit magnetic properties in the ground state. Moreover, we observed the emergence of magnetic transition from a ferromagnetic to an antiferromagnetic state in a CoO NW under surface oxidation. We show that the magnetic properties of oxidized NWs depend strongly on the surface geometry. The study of the electronic structure of CoO NWs explains the reason for the formation of several magnetic states. The analysis of band structures of pure and oxidized Co NW shows that changes in magnetic states can be explained by the changes in band structure due to oxidation and that oxidation decreases the value of magnetic moments of the Co atoms in comparison to the pure NW. However, the values of these moments are still high.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Two Possible Ways of Forming Ordered Magnetic Chains on a Metal Surface:
           Monte Carlo Simulations

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      Authors: Alexey Syromyatnikov;Andrey Klavsyuk;Alexander Saletsky;
      Pages: 1 - 3
      Abstract: In this letter, the evolution of Co chains on a Cu(997) surface and mixed CoNi chains on a Ir(001) surface is investigated on the atomic scale by performing Monte Carlo simulations. It was found that ordered chains can be formed from a single metal with a temperature gradient or from an alloy of metals. It is shown how the chain lengths change during annealing and cooling. The results of our simulations will be useful for creating a new generation of magnetic materials.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • From the Spin Eigenmodes of Isolated Néel Skyrmions to the Magnonic Bands
           of Skyrmionic Crystals: A Micromagnetic Study as a Function of the
           Interfacial Dzyaloshinskii-Moriya Interaction and the Exchange Constants

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      Authors: Mattia Bassotti;Raffaele Silvani;Giovanni Carlotti;
      Pages: 1 - 5
      Abstract: The presence of interfacial Dzyaloshinskii-Moriya interaction (DMI) may lead to the appearance of Néel skyrmions in ferromagnetic films. These topologically protected structures, whose diameter is as small as a few nanometers, can be nowadays stabilized at room temperature and have been proposed for the realization of artificial magnonic crystals and new spintronic devices, such as racetrack memories. In this perspective, it is of utmost importance to analyze their dynamical properties in the gigahertz range, i.e., in the operation range of current communication devices. In this letter, we exploited the software MuMax3 to calculate the dynamics of Néel skyrmions in the range between 1 and 30 GHz, considering first the eigenmodes of an isolated skyrmion, then the case of two interacting skyrmions, and finally a linear chain, representing a one-dimensional magnonic crystal, whose magnonic band structure has been calculated as a function of the strength of both the DMI- and the exchange-constants, namely $D$ and $A$. The magnonic bands can be interpreted as derived from the eigenmodes of isolated skyrmions, even if hybridization and anticrossing phenomena occur for specific ranges of values of $D$ and $A$. Therefore, varying the latter parameters, for instance, by a proper choice of the materials and thicknesses, may enable one to fine-tune the permitted and forbidden frequency interval of the corresponding magnonic crystal.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Dendritic Growth of Co/Cu Nanostructures on Stepped Cu(111) Surface

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      Authors: Sergei A. Dokukin;Sergey V. Kolesnikov;Alexander M. Saletsky;
      Pages: 1 - 5
      Abstract: Self-learning kinetic Monte Carlo simulations are applied to simulate the growth of Co–Cu protrusions near step edges on a Cu(111) substrate at various temperatures, deposition fluxes, and relative concentrations. The shape of the dendritic protrusions depends on the relative concentration of the Co atom. The dependence of the fractal dimension of Co–Cu protrusions on the relative concentration of Co atoms can be monotonic or nonmonotonic, depending on temperature. The protrusions have Co backbones, whose fractal dimension differs from the fractal dimension of the entire Co–Cu protrusion.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • One-Dimensional Magneto-Optical Nanostructures: Template Synthesis,
           Structure, Properties, and Application in Spectroscopy Based on Plasmon
           Resonance

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      Authors: Elizaveta Kozhina;Ekaterina Kulesh;Sergey Bedin;Ilia Doludenko;Alexey Piryazev;Ilya Korolkov;Artem Kozlovskiy;Maxim Zdorovets;Alexander Rogachev;Alena Shumskaya;
      Pages: 1 - 5
      Abstract: A method for the formation of magneto-optical one-dimensional (1-D) nanostructures by the electrodeposition method into the pores of track-etched membranes is presented in this letter. Two possible techniques are considered: the synthesis of magnetic nanotubes and their subsequent coating with silver, as well as the synthesis of vertical-standing arrays of layered magneto-optical nanowires (NWs) with alternating layers of nickel and silver. The resulting nanotubes and NWs are polycrystalline microstructures with a nanostructured plasmon-active surface. The absorption spectra have a distinct peak corresponding to the position of the local plasmon resonance: in the near-infrared range for the nickel nanotubes coated with silver and in the optical range for the layered NWs. For layered NWs, there is a combination of absorption peaks of both silver and nickel. The use of the obtained 1-D magneto-optical nanostructures for the formation of plasmon-active magnetically controlled substrates as surface-enhanced Raman spectroscopy (SERS) active surfaces is suggested for the detection of Rhodamine 6G in concentration down to 10–9 M. The increase of SERS signal intensity by using a magnetic field is shown for concentration 10−3 M with an extra signal amplification of more than four times.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Magnetic Properties of 3d Metal Rods With Composition Gradients Produced
           by Electroless Deposition

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      Authors: Elena A. Denisova;Lidia A. Chekanova;Sergey V. Komogortsev;Svetlana A. Satsuk;Ivan V. Nemtsev;Rauf S. Iskhakov;Sergey V. Semenov;
      Pages: 1 - 5
      Abstract: A comparative study of the magnetic properties of arrays of Co–Ni rods with different composition gradients (smooth or step-like) along the rod axes was carried out. Ordered arrays of Co–Ni nanorods with diameters up to 400 nm and 8 µm length were prepared by electroless plating into a porous nuclear-track-etched polycarbonate membrane. The gradient in Co and Ni composition was confirmed by energy-dispersive X-ray analysis. The variation of Co–Ni contents along the long axis of the rods correlates with the gradient of the magnetization within the rod. Magnetization reversal was studied by analyzing the angular dependence of coercivity and using micromagnetic simulations. For both types of gradient rods, reversal occurs by curling. The local magnetic anisotropy field of rods with a step-type gradient is significantly higher than that for rods with a smooth gradient.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Experimental Demonstration of a Spin-Wave Lens Designed With Machine
           Learning

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      Authors: Martina Kiechle;Levente Maucha;Valentin Ahrens;Carsten Dubs;Wolfgang Porod;Gyorgy Csaba;Markus Becherer;Adam Papp;
      Pages: 1 - 5
      Abstract: In this letter, we present the design and experimental realization of a device that acts like a spin-wave lens i.e., it focuses spin waves to a specified location. The structure of the lens does not resemble any conventional lens design. It is a nonintuitive pattern produced by a machine-learning algorithm. As a spin-wave design tool, we used our custom micromagnetic solver SpinTorch, which has built-in automatic gradient calculation and can perform backpropagation through time for spin-wave propagation. The training itself is performed with the saturation magnetization of a yttrium-iron-garnet (YIG) film as a variable parameter, with the goal to guide spin waves to a predefined location. We verified the operation of the device in the widely used mumax$^{3}$ micromagnetic solver, and by experimental realization. For the experimental implementation, we developed a technique to create effective saturation-magnetization landscapes in YIG by direct focused-ion-beam (FIB) irradiation. This allows us to rapidly transfer the nanoscale design patterns to the YIG medium, without patterning the material by etching. We measured the effective saturation magnetization corresponding to the FIB dose levels in advance and used this mapping to translate the designed scatterer to the required dose levels. Our demonstration serves as a proof of concept for a workflow that can be used to realize more sophisticated spin-wave devices with complex functionality, e.g., spin-wave signal processors, or neuromorphic devices.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Iterative Multihead Multitrack Detection Scheme for Bit-Patterned Media
           Recording

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      Authors: Gyuyeol Kong;Taehyoung Kim;Minchae Jung;
      Pages: 1 - 5
      Abstract: An iterative multihead multitrack detection scheme for bit-patterned media recording is described in this letter. The scheme employs two iterative strategies with multihead, multitrack detection where three tracks are simultaneously processed to accurately estimate the channel with track misregistration (TMR) and effectively detect the data by using intertrack interference (ITI) information with high reliability. The first outer iteration aims to compensate for the TMR effect, and the second inner iteration aims to improve the reliability of the data. In the outer iteration, the TMR effect is compensated by modifying the generalized partial response (GPR) target to a channel that reflects the TMR estimated by a TMR estimator using an expectation and maximization algorithm. In the inner iteration, iterative equalization and decoding (IED) is conducted between the two-dimensional partial response maximum-likelihood detector and the low-density parity check decoder based on the revised GPR target. Since each track has a different channel performance according to the amount of ITI information in the multitrack detection, we design the GPR target and the code rate separately for each track to maximize the overall channel performance. The bit error rate performances of the proposed IED scheme are compared with the conventional IED scheme when the areal density is 2 $text{Tb/in}^{2}$. Simulation results show that the IED scheme has more than 2 dB gain compared with the conventional IED scheme for 30$%$ TMR.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Effect of Magnetic Fields on the Optical Density of Magnetic Emulsions
           With Low Interfacial Tension

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      Authors: Sergey S. Belykh;Constantine V. Yerin;
      Pages: 1 - 5
      Abstract: In this letter, the features of the optical effect of changing the optical density of a magnetic emulsion with a low interfacial tension areinvestigated. A change in the sign of the effect was found with an increase in the duration of exposure to a longitudinalmagnetic field. The interpretation of the effect is based on the approximation of anomalous diffraction. It is shown that the change in the sign of the effect of changing the optical density is associated with the coalescence of microdroplets of the magnetic emulsion under prolonged exposure to a magnetic field.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Field-Induced Pseudoplasticity of Magnetoactive Elastomers: A Phase
           Transition Interpretation

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      Authors: Oleg V. Stolbov;Yuriy L. Raikher;
      Pages: 1 - 5
      Abstract: In this letter, we present a new phenomenological model that on a unified basis accounts for the field/stress response of a magnetoactive elastomer that displays a so-called induced pseudoplasticity. The essence of the effect is that a composite with a sufficiently high content of the ferromagnet filler behaves elastically under zero/low field but, being subject to a stronger one, abruptly changes its mechanical response to plasticity. However, upon removing the field, the sample elasticity is restored. As a first try, a one-dimensional (1-D) variant of the model is developed. Its comparison with the results obtained in a series of mesoscopic numerical experiments performed with a quasi-1-D sample demonstrates fairly good agreement.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Terbium Substitution Effects in CeFe2: Structure and Magnetic
           Properties

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      Authors: Dmitry A. Morozov;Galina A. Politova;Maksim A. Ganin;Aleksandra B. Mikhailova;Tatiana P. Kaminskaya;Vladimir V. Popov;Aleksey V. Filimonov;Aleksey Yu Karpenkov;
      Pages: 1 - 5
      Abstract: The crystal structure and magnetic properties of multicomponent compounds $text{Ce}_{1-x}text{Tb}_{x} text{Fe}_{2}$ ($x$ = 0, 0.1, 0.2, 0.3, 0.5, 0.7) are studied in this letter. Compounds crystallize in a structure of the MgCu2 type; the content of the second phase (PuNi3-type, R3m space group) averaged 5%–8%. The parameters of the unit cell were determined and the surface of the sample was investigated by atomic force and magnetic force microscopy. In the temperature range 90–600 K, the magnetization of the alloys was investigated, and the Curie temperature was determined. Information was obtained on the magnetocaloric and magnetostrictive properties of the compounds under study.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Magnetic Phase Transitions in GdH0.15: Some Peculiarities in the Behavior
           of Magnetocaloric and Magnetostrictive Effects

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      Authors: Galina A. Politova;Irina S. Tereshina;Evgenia A. Tereshina-Chitrova;Barbora Vondráčková;Jiří Pospíšil;Mikhail A. Paukov;Alexander V. Andreev;
      Pages: 1 - 5
      Abstract: The magnetocaloric effect (MCE) and anomalies of magnetostriction behavior were studied at the order-order and order-disorder magnetic phase transitions in hydrided Gd single crystal grown by a modified Czochralski method. The composition GdH0.15 was obtained using a Sievert-type apparatus. While parent Gd shows an isotropic MCE at the order-disorder phase transition, the effect is anisotropic in GdH0.15 due to the appearance of local anisotropy. We investigate in detail the temperature variation of the longitudinal, transverse, volume, and anisotropic magnetostriction. Hydrogenation is found to influence both the magnitude and the sign of the magnetostriction constants $lambda_{rm ij}^{alpha}$.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Normal Stress of a Micro–Nano Magnetorheological Elastomer

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      Authors: Xuhui Liu;Jinghu Wang;Huina Hu;Ziyun Fang;Bin Xu;Yan Wu;Lei Gao;Meiling Pu;
      Pages: 1 - 4
      Abstract: A micro–nano magnetorheological elastomer (MRE) containing Fe3O4 nanoparticles was prepared, and its mechanical properties were analyzed. A microscopic static force model was used for MREs with different concentrations of nanomagnetic particles. To investigate the mechanical properties, an experimental platform was built, and its magnetic field flux was simulated with finite-element software. The results show that the maximum compressive elastic modulus for MREs containing 10% Fe3O4 nanoparticles is 2.89 MPa, which is 149% that of a traditional MRE under the same magnetic field. The normal stress of micro–nano MRE was significantly improved, which could be useful in the development of high-performance MREs.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Longitudinal Transformation of Magnetic Properties in Magnetic Microwires
           With Graded Magnetic Anisotropy

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      Authors: Alexander Chizhik;Paula Corte-León;Valentina Zhukova;Julian Gonzalez;Arcady Zhukov;
      Pages: 1 - 5
      Abstract: We studied the magneto-optical and magnetic behavior of Co- and Fe-rich microwires that were stress-annealed at temperatures distributed along the microwire length. There was a transformation of the magnetic structure across zones subjected to annealing at different temperatures. Differences in the magnetic behavior between the surface and bulk were observed for both Co- and Fe-rich microwires. The formation and subsequent transformation of a helical magnetic structure were observed, depending on the type of microwire. Annealing at temperatures below 100 °C affected the magnetic system of microwires. This effect is due to a weak but noticeable relaxation of the initial stresses in all parts of the microwire that even occurs in the low temperature range.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Micromagnetic Simulation of Nitrogenation Effect on the Magnetic
           Properties of Sm2Fe17N3 Alloy

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      Authors: Zhi Yang;Yuanyuan Chen;Yuqing Li;Dongtao Zhang;Weiqiang Liu;Qingmei Lu;Qiong Wu;Hongguo Zhang;Ming Yue;
      Pages: 1 - 5
      Abstract: Nitrogenation is an indispensable process for the formation of Sm2Fe17N3 and has a major influence on its magnetic properties. In this work, the effect of nitrogenation on the magnetic properties of Sm2Fe17N3 was investigated by micromagnetic simulation. The normal coercivity, remanence, and the maximum energy product of incompletely nitrided Sm2Fe17N3 with a nonnitrided Sm2Fe17 core size less than 16 nm approach nearly 99% of their values in fully nitrided Sm2Fe17N3. Thus, a small nonnitrided Sm2Fe17 core does not affect the effective utilization of Sm2Fe17N3 permanent magnets. The magnetization reversal mode of incompletely nitrided Sm2Fe17N3 with different sizes of nonnitrided Sm2Fe17 cores was evaluated, providing an in-depth fundamental understanding of the demagnetization processes in Sm2Fe17N3 particles. This work could be useful for optimizing nitrogenation conditions to improve the magnetic properties of Sm2Fe17N3 permanent magnets.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Field-Free Line Magnetic Particle Imaging Magnet Design Using Nested
           Halbach Cylinders

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      Authors: Melike Ergor;Ayhan Bingolbali;
      Pages: 1 - 4
      Abstract: Magnetic particle imaging (MPI) is a novel imaging technique that is a promising candidate for practical use in the medical field. The field-free line (FFL) selection field method in MPI provides spatial encoding along a line, resulting in a faster acquisition time and enhanced sensitivity with increased signal-to-noise ratio. To obtain FFL, a magnet system was designed using nested Halbach rings with octagonal-shaped permanent magnets. In this specific study, simulation studies were implemented using this magnet system for a real case. For this purpose, gradient values and stabilities of the magnet system were calculated. In this investigation, a gradient field within 60 mm stability was obtained along each axis. The gradient field attained values up to 6.1 T/m, which is a highly important parameter for spatial resolution in MPI systems.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Synthesis of NdFeB Magnetic Particles With High (BH)max From Their
           Optimized Oxide Powders Through Reduction–Diffusion Method

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      Authors: Rambabu Kuchi;Vitalii Galkin;Seunghyun Kim;Jong-Ryul Jeong;Soon-jik Hong;Dongsoo Kim;
      Pages: 1 - 4
      Abstract: Neodymium–iron–boron (NdFeB) magnetic particles with high (BH)max were obtained using optimized ball-milled (BM) NdFeB oxide powders, instead of unmilled NdFeB oxide powders, through combined chemical processes comprising the spray drying and reduction-diffusion (RD) methods. The NdFeB oxide particles were subjected to the BM process to control their structural properties, including shape and size of the particles. The oxide powders were critical to make the NdFeB magnetic particles with enhanced properties by the RD process. In general, the controlled structural properties of the NdFeB oxide particles have a significant impact on the properties of final NdFeB magnetic particles. This has been explored through the NdFeB magnetic particles synthesized by utilizing BM oxide powders (0, 1, 2, and 4 h) at different time intervals. One-hour BM oxide powders yielded NdFeB magnetic particles with higher magnetic properties: (BH)max of 14.06 MG·Oe, coercivity (HC) of 3.9 kOe, and remanence (MR) of 101 emu/g. This was attributed to minimal shape defects and phase purity with high crystallinity for the optimized BM oxide powders. Thus, NdFeB oxide particles directed the final intermetallic NdFeB magnetic particles structural properties, which strongly affected their magnetic properties. This study on oxide powders BM will be useful for the preparation of other intermetallic alloys with enhanced properties.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Control of Time Delay in Magnetic Levitation Systems

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      Authors: Yougang Sun;Sumei Wang;Yang Lu;Junqi Xu;Si Xie;
      Pages: 1 - 5
      Abstract: The high-performance control of magnetic levitation (maglev) vehicles has encountered challenges in the form of time delays. In this letter, we model a reliable control method based on a Takagi-Sugeno fuzzy model aimed at solving the problem of air gap control of a magnetic levitation system for a maglev vehicle under time-delay conditions. The key idea is based on the global fuzzy model derived through sector nonlinearity to design a global controller utilizing the parallel distributed compensation method and ${H_infty }$ method. As a result, the stability of the system is guaranteed under conditions of mass parameter uncertainty, disturbance, and time delay. The theoretical analysis, numerical simulations, and experimental results consistently show the effectiveness of the control method.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Multifrequency AC Magnetic Flux Leakage Testing for the Detection of
           Surface and Backside Defects in Thick Steel Plates

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      Authors: Gang Wang;Qi Xiao;Zihao Gao;Wenhui Li;Liang Jia;Ce Liang;Xue Yu;
      Pages: 1 - 5
      Abstract: The detection of surface and backside defects in steel plates is essential for safety maintenance. Current ac magnetic flux leakage (ACMFL) testing systems generally operate at a high frequency but cannot detect backside defects owing to the skin effect. Low-frequency ACMFL is limited by low sensitivity and low efficiency in detecting deep defects. This letter presents a multifrequency ACMFL testing method combined with the merits of low- and high-frequency excitation to detect surface and backside defects. In early work, the optimal frequency for detecting the surface defect with a depth of 4 mm or less was 400 Hz. Through simulation analysis, the optimal low frequency for detecting backside defects is determined. Additionally, the influence of the excitation intensity on the response signal is investigated. Relatively small excitation power should be used to obtain a reliable detection waveform. Finally, the experimental results of surface and backside defects detection validated the practicality of the method.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Open-Structure Magnetic Particle Spectroscopy (OMPS): Feasibility Study

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      Authors: Chan Kim;Jiyun Nan;Jayoung Kim;Jong-Oh Park;Chang-Sei Kim;
      Pages: 1 - 5
      Abstract: Magnetic nanoparticles (MNPs) have been widely used as effective agents for actuation and localization for targeted drug delivery. Especially for the localization of MNPs, magnetic particle imaging (MPI) has been developed to use magnetization generated by a magnetic field. However, most MPI systems use a bore-type structure, and there exist limitations in terms of working space, compatibility with surrounding medical devices, and being able to respond to emergency situations from a medical perspective. To address these issues, we present a novel, open-structure, magnetic particle spectroscopy (OMPS) technique. The structural design, theoretical background, and analysis of the OMPS are presented, and experiments are conducted to evaluate the OMPS. The experimental results indicate that the detection volume can be obtained as a cylindrical region of interest (ROI) of 50 mm × 50 mm × 25 mm, and the feasibility can be exhibited within the same or larger ROI with similar amounts of Resovist as used in previous MPI studies. The results demonstrate the promising potential for OMPS.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Rogowski Coil With Ferromagnetic Powder Core

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      Authors: Václav Grim;Pavel Ripka;
      Pages: 1 - 4
      Abstract: We have used nanocrystalline powder to build a core for Rogowski coils suitable for application in energy meters. The sensor linearity error is 0.32% of full scale (FS) of its 20 A range, which is acceptable for this application. The main advantages of the new core are 15-fold increase in sensitivity, which results in lower noise, and high rejection of direct current. It operates at up to 1000 A dc with 20% change in sensitivity. Resulting accuracy of power measurement using a single-chip digital power meter is 0.22% FS.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Measurement System for Characterization of Ferromagnetic Cores Under
           Controlled Magnetic Field Waveform

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      Authors: Branko M. Koprivica;Milan V. Plazinić;
      Pages: 1 - 5
      Abstract: The aim of this letter is to present a prototyping measurement system for the characterization of ferromagnetic cores under a controlled magnetic field. The main part of the system is a short-circuited magnetizing coil that forms a relatively large square loop. The loop stands fixed in the vertical plane, and it is equipped on one side of the square with a connector for opening and closing of the loop. Thus, a ring-shaped core made of grain-oriented electrical steel can be placed around the loop and become magnetized. A number of measurements have been performed using the system to validate its applicability. Experiments were performed for the sinusoidal and triangular waveforms of the magnetic field, under quasistatic and dynamic conditions. In addition to the presentation of the measurement system, this letter also presents measured hysteresis loops and corresponding energy loss. Part of the results obtained with the presented method are compared with the results obtained using the standardized method. The main features of the measurement system are discussed.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Combined Attitude Determination for Real-Time Geomagnetic Navigation

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      Authors: Weilin Wang;Zhaonan Jin;Linliang Miao;Zhihao Yang;Sasa Mi;Yijie Qin;Xingzhong Yao;Jun Ou-Yang;Xiaofei Yang;
      Pages: 1 - 5
      Abstract: In this letter, we present a novel algorithm to calculate attitude with data measured by a magnetometer and an accelerometer. The calculation error for the attitude angles is not affected by the external motion acceleration parallel to the plane, which is composed of the gravitational field and geomagnetic field. The simulation and actual experimental results have revealed that the algorithm improved the accuracy of the attitude estimated in roll or pitch angles for different flight directions compared with the arc-tangent attitude solution method. Our algorithm provides a new model for attitude estimation through a vector observation method and has excellent prospects in real-time, satellite-free geomagnetic navigation.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • An Optimized Magnet Circuit Design to Reduce Power Consumption for
           Torsional Electromagnetic Actuators

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      Authors: Xian Shi;Guifu Ding;
      Pages: 1 - 5
      Abstract: A torsional electromagnetic actuator that is actuated by the torque applied to a planar coil in an external magnetic field is designed, modeled, and analyzed in this letter. The analytical model of the magnetic torque is established. A magnet combination consisting of a rectangular magnet and a square-ring magnet magnetized in opposite directions is developed. A novel magnetic circuit is designed and analyzed to increase the driving torque. The electromagnetic and mechanical responses of the device are characterized by finite element simulation. In the case study, the power consumption of the actuator is significantly reduced by 54.3%, and down to 3.05 mW at the mechanical torsion angle of 11°. The effect of air gap on power consumption is also studied quantitatively.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
  • Novel Magnetic Localization Methods for Minimizing the Ellipse Error Based
           on Tensor Invariants

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      Authors: Xiangang Li;Shenggang Yan;Jianguo Liu;Youyu Yan;
      Pages: 1 - 5
      Abstract: There are various technology routes for the localization of magnetic targets. Among them, localization methods based on magnetic gradient tensor invariants have remarkable preponderance. For instance, such invariants are not sensitive to the jitter of the coordinate system, which means this kind of method can be very suitable for application in moving carriers. The traditional classic method contains ellipse error, which cannot be simply ignored. In order to eliminate this error, the general solution of the location vector is derived in this letter. Three methods for solving the general solution are given. To validate the effectiveness of the methods, the localization problem of the measurement array surrounding a static target is simulated. In this simulation, the localization results of the traditional method and the proposed methods are analyzed and compared. The conclusions show that the developed methods successfully remove the ellipse error and improve the localization accuracy.
      PubDate: 2022
      Issue No: Vol. 13 (2022)
       
 
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