Subjects -> PHYSICS (Total: 857 journals)
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    - NUCLEAR PHYSICS (53 journals)
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PHYSICS (625 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica     Open Access   (Followers: 4)
Acta Mechanica     Hybrid Journal   (Followers: 22)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 75)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 71)
Advanced Materials     Hybrid Journal   (Followers: 255)
Advanced Quantum Technologies     Hybrid Journal   (Followers: 3)
Advanced Science Focus     Free   (Followers: 6)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advances in Clinical Radiology     Full-text available via subscription   (Followers: 4)
Advances in Condensed Matter Physics     Open Access   (Followers: 5)
Advances in Geophysics     Full-text available via subscription   (Followers: 7)
Advances in High Energy Physics     Open Access   (Followers: 23)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 4)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 33)
Advances in Natural Sciences : Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances In Physics     Hybrid Journal   (Followers: 29)
Advances in Physics : X     Open Access   (Followers: 4)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Remote Sensing     Open Access   (Followers: 59)
Aggregate     Open Access   (Followers: 1)
AIP Advances     Open Access   (Followers: 7)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 2)
American Journal of Condensed Matter Physics     Open Access   (Followers: 7)
American Journal of Signal Processing     Open Access   (Followers: 14)
Anales (Asociación Física Argentina)     Open Access  
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 9)
Annalen der Physik     Hybrid Journal   (Followers: 5)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 21)
Annales Henri Poincaré     Hybrid Journal   (Followers: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 6)
Annals of Physics     Hybrid Journal   (Followers: 7)
Annals of West University of Timisoara - Physics     Open Access   (Followers: 1)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 12)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (Followers: 3)
Annual Review of Materials Research     Full-text available via subscription   (Followers: 8)
APL Materials     Open Access   (Followers: 12)
Applied Composite Materials     Hybrid Journal   (Followers: 54)
Applied Mathematics and Physics     Open Access   (Followers: 2)
Applied Physics A     Hybrid Journal   (Followers: 15)
Applied Physics Frontier     Open Access   (Followers: 2)
Applied Physics Letters     Hybrid Journal   (Followers: 44)
Applied Physics Research     Open Access   (Followers: 5)
Applied Physics Reviews     Hybrid Journal   (Followers: 11)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 4)
Applied Spectroscopy     Full-text available via subscription   (Followers: 24)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 4)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 1)
Asia Pacific Physics Newsletter     Hybrid Journal   (Followers: 1)
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
ASTRA Proceedings     Open Access   (Followers: 3)
Astronomy & Geophysics     Hybrid Journal   (Followers: 49)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 39)
Atoms     Open Access   (Followers: 1)
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 15)
Axioms     Open Access   (Followers: 1)
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 1)
Biomaterials     Hybrid Journal   (Followers: 55)
Biomedical Imaging and Intervention Journal     Open Access   (Followers: 5)
Biophysical Reviews     Hybrid Journal   (Followers: 2)
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 5)
BJR|Open     Open Access  
Boson Journal of Modern Physics     Open Access   (Followers: 9)
Brazilian Journal of Physics     Hybrid Journal  
Bulletin of Materials Science     Open Access   (Followers: 43)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 7)
Bulletin of the Lebedev Physics Institute     Hybrid Journal  
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal   (Followers: 1)
Caderno Brasileiro de Ensino de Física     Open Access  
Canadian Journal of Physics     Hybrid Journal   (Followers: 11)
Cell Reports Physical Science     Open Access  
Cells     Open Access   (Followers: 2)
CERN courier. International journal of high energy physics     Free   (Followers: 8)
Chemical Physics Impact     Full-text available via subscription  
ChemPhysMater     Full-text available via subscription  
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Journal of Physics     Hybrid Journal   (Followers: 1)
Ciencia     Open Access  
Clinical Spectroscopy     Open Access   (Followers: 1)
Cogent Physics     Open Access  
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Communications Materials     Open Access  
Communications Physics     Open Access  
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 177)
Composites Part B : Engineering     Hybrid Journal   (Followers: 222)
Composites Part C : Open Access     Open Access   (Followers: 2)
Computational Astrophysics and Cosmology     Open Access   (Followers: 6)
Computational Condensed Matter     Open Access   (Followers: 1)
Computational Materials Science     Hybrid Journal   (Followers: 25)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 5)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computer Physics Communications     Hybrid Journal   (Followers: 9)
Condensed Matter     Open Access   (Followers: 2)
Contemporary Physics     Hybrid Journal   (Followers: 26)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
Cryogenics     Hybrid Journal   (Followers: 61)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 116)
Diagnostic and Interventional Imaging     Full-text available via subscription  
Diamond and Related Materials     Hybrid Journal   (Followers: 10)
Discrete and Continuous Models and Applied Computational Science     Open Access  
Doklady Physics     Hybrid Journal   (Followers: 1)
e-Boletim da Física     Open Access  
East European Journal of Physics     Open Access   (Followers: 1)
Edufisika : Jurnal Pendidikan Fisika     Open Access  
EDUSAINS     Open Access  
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 25)
EJNMMI Physics     Open Access  
Emergent Scientist     Open Access  
Engineering Failure Analysis     Hybrid Journal   (Followers: 68)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 24)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 11)
EPJ Quantum Technology     Open Access   (Followers: 2)
EPJ Techniques and Instrumentation     Open Access  
EPJ Web of Conferences     Open Access   (Followers: 1)
EUREKA : Physics and Engineering     Open Access  
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 19)
European Physical Journal C     Hybrid Journal   (Followers: 2)
Europhysics News     Open Access  
Experimental and Computational Multiphase Flow     Hybrid Journal  
Experimental Mechanics     Hybrid Journal   (Followers: 21)
Experimental Techniques     Hybrid Journal   (Followers: 51)
Exploration Geophysics     Hybrid Journal   (Followers: 4)
Few-Body Systems     Hybrid Journal   (Followers: 1)
Fire and Materials     Hybrid Journal   (Followers: 5)
FirePhysChem     Open Access  
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 2)
Fluctuation and Noise Letters     Hybrid Journal  
Fluid Dynamics     Hybrid Journal   (Followers: 27)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Nanotechnology     Open Access   (Followers: 1)
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 5)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 6)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 35)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 4)
Geophysical Research Letters     Full-text available via subscription   (Followers: 162)
Giant     Open Access  
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Granular Matter     Hybrid Journal  
Graphs and Combinatorics     Hybrid Journal   (Followers: 4)
Gravitation and Cosmology     Hybrid Journal   (Followers: 6)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 11)
High Energy Density Physics     Hybrid Journal   (Followers: 3)
High Pressure Research: An International Journal     Hybrid Journal   (Followers: 3)
Himalayan Physics     Open Access   (Followers: 1)
IEEE Embedded Systems Letters     Hybrid Journal   (Followers: 60)
IEEE Journal of Quantum Electronics     Hybrid Journal   (Followers: 19)
IEEE Journal on Multiscale and Multiphysics Computational Techniques     Hybrid Journal  
IEEE Magnetics Letters     Hybrid Journal   (Followers: 7)
IEEE Nanotechnology Magazine     Hybrid Journal   (Followers: 45)
IEEE Reviews in Biomedical Engineering     Hybrid Journal   (Followers: 19)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 98)
IEEE Solid-State Circuits Magazine     Hybrid Journal   (Followers: 11)
IEEE Transactions on Autonomous Mental Development     Hybrid Journal   (Followers: 8)
IEEE Transactions on Biomedical Engineering     Hybrid Journal   (Followers: 35)
IEEE Transactions on Broadcasting     Hybrid Journal   (Followers: 11)
IEEE Transactions on Geoscience and Remote Sensing     Hybrid Journal   (Followers: 174)
IEEE Transactions on Haptics     Hybrid Journal   (Followers: 4)
IEEE Transactions on Industrial Electronics     Hybrid Journal   (Followers: 85)
IEEE Transactions on Industry Applications     Hybrid Journal   (Followers: 57)
IEEE Transactions on Learning Technologies     Full-text available via subscription   (Followers: 12)
IEEE Transactions on Quantum Engineering     Open Access   (Followers: 3)
IEEE Transactions on Services Computing     Hybrid Journal   (Followers: 5)
IEEE Transactions on Software Engineering     Hybrid Journal   (Followers: 84)
IEEE Women in Engineering Magazine     Hybrid Journal   (Followers: 11)
IEEE/OSA Journal of Optical Communications and Networking     Hybrid Journal   (Followers: 19)
IET Optoelectronics     Open Access   (Followers: 2)
Il Colle di Galileo     Open Access  
Image Analysis & Stereology     Open Access   (Followers: 1)
Imaging Science Journal     Hybrid Journal   (Followers: 3)
ImmunoInformatics     Open Access   (Followers: 1)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Physics     Hybrid Journal   (Followers: 18)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 36)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 49)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal   (Followers: 1)
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal   (Followers: 11)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 12)
Intermetallics     Hybrid Journal   (Followers: 21)
International Applied Mechanics     Hybrid Journal   (Followers: 5)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 5)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 13)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 5)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 37)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 3)

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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

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      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)
       
  • 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)
       
  • 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)
       
  • 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)
       
  • 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)
       
  • 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)
       
  • 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)
       
  • 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)
       
 
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