Subjects -> PHYSICS (Total: 857 journals)
    - ELECTRICITY AND MAGNETISM (10 journals)
    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 journals)
    - PHYSICS (625 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (30 journals)

PHYSICS (625 journals)            First | 1 2 3 4 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 36)
International Journal of Biological, Physical and Chemical Studies     Open Access  
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 7)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Engineering and Applied Physics     Open Access  
International Journal of Fatigue     Hybrid Journal   (Followers: 41)
International Journal of Fracture     Hybrid Journal   (Followers: 14)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 41)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 17)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 2)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 14)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 7)
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology     Open Access   (Followers: 11)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 12)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 3)
International Journal of Modern Physics A     Hybrid Journal   (Followers: 15)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 12)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 14)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 13)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 13)
International Journal of Multiphysics     Open Access  
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal  
International Journal of Nanotechnology     Hybrid Journal   (Followers: 9)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 8)
International Journal of Nonlinear Dynamics and Control     Hybrid Journal   (Followers: 6)
International Journal of Physics     Open Access   (Followers: 10)
International Journal of PIXE     Hybrid Journal  
International Journal of Plasticity     Hybrid Journal   (Followers: 7)
International Journal of Quantum Information     Hybrid Journal   (Followers: 6)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal  
International Journal of Solids and Structures     Hybrid Journal   (Followers: 14)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Theoretical and Applied Multiscale Mechanics     Hybrid Journal   (Followers: 3)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 13)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 17)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 18)
International Journal on Smart Sensing and Intelligent Systems     Open Access  
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 8)
International Materials Reviews     Hybrid Journal   (Followers: 15)
Iranian Journal of Medical Physics     Open Access  
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jambura Physics Journal     Open Access  
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 10)
Journal of Advanced Physics     Full-text available via subscription   (Followers: 13)
Journal of Advances in Physics     Open Access   (Followers: 13)
Journal of Applied Mathematics and Physics     Open Access   (Followers: 9)
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 7)
Journal of Applied Physics     Hybrid Journal   (Followers: 69)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Astrophysics     Open Access   (Followers: 33)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 58)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 15)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 243)
Journal of Computational and Theoretical Transport     Hybrid Journal   (Followers: 2)
Journal of Computational Methods in Physics     Open Access   (Followers: 8)
Journal of Computational Physics     Hybrid Journal   (Followers: 59)
Journal of Computational Physics : X     Open Access   (Followers: 1)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 14)
Journal of Elasticity     Hybrid Journal   (Followers: 7)
Journal of Electron Spectroscopy and Related Phenomena     Hybrid Journal   (Followers: 3)
Journal of Electronic Materials     Hybrid Journal   (Followers: 3)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 9)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 17)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 2)
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 4)
Journal of Experimental Physics     Open Access   (Followers: 3)
Journal of Fire Sciences     Hybrid Journal   (Followers: 6)
Journal of Geometry and Physics     Full-text available via subscription   (Followers: 2)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 136)
Journal of Gravity     Open Access   (Followers: 4)
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 25)
Journal of High Energy Physics     Hybrid Journal   (Followers: 17)
Journal of High Energy Physics, Gravitation and Cosmology     Open Access   (Followers: 2)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 23)
Journal of Imaging     Open Access   (Followers: 3)
Journal of Information Display     Open Access   (Followers: 1)
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 8)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 14)
Journal of Low Frequency Noise, Vibration and Active Control     Open Access   (Followers: 8)
Journal of Luminescence     Hybrid Journal   (Followers: 2)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 22)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 7)
Journal of Materials Science     Hybrid Journal   (Followers: 25)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 2)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 1)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 10)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 25)
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Medical Ultrasonics     Hybrid Journal   (Followers: 2)
Journal of Micro/Nanolithography MEMS and MOEMS     Hybrid Journal   (Followers: 24)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Motor Behavior     Hybrid Journal   (Followers: 8)
Journal of Multiscale Modeling     Hybrid Journal   (Followers: 1)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Nonlinear Dynamics     Open Access   (Followers: 6)
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 2)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access   (Followers: 6)
Journal of Optics     Hybrid Journal   (Followers: 17)
Journal of Photonics for Energy     Hybrid Journal   (Followers: 2)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry B     Hybrid Journal   (Followers: 48)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 18, SJR: 2.461, CiteScore: 3)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 8)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Polymer Science Part B: Polymer Physics     Hybrid Journal   (Followers: 22)
Journal of Porous Materials     Hybrid Journal   (Followers: 4)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Quantitative Spectroscopy and Radiative Transfer     Hybrid Journal   (Followers: 3)
Journal of Reinforced Plastics and Composites     Hybrid Journal   (Followers: 30)
Journal of Rheology     Full-text available via subscription   (Followers: 7)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 4)
Journal of Scientific Research     Open Access  
Journal of Sensors     Open Access   (Followers: 25)
Journal of Sol-Gel Science and Technology     Hybrid Journal  
Journal of Solid State Physics     Open Access   (Followers: 8)
Journal of Spectroscopy     Open Access   (Followers: 6)
Journal of Superconductivity and Novel Magnetism     Partially Free   (Followers: 1)
Journal of Synchrotron Radiation     Open Access   (Followers: 3)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 32)
Journal of the ICRU     Hybrid Journal  
Journal of the Korean Physical Society     Partially Free  
Journal of the Physical Society of Japan     Hybrid Journal   (Followers: 2)
Journal of Theoretical and Applied Physics     Open Access   (Followers: 9)
Journal of Tissue Engineering     Open Access   (Followers: 6)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 11)
Journal of Vibration and Control     Hybrid Journal   (Followers: 42)
Journal of Visualization     Hybrid Journal   (Followers: 3)
Journal of Zhejiang University : Sceince A     Hybrid Journal  
JPSE (Journal of Physical Science and Engineering)     Open Access  
Jurnal Fisika     Open Access  
Jurnal Ilmiah Pendidikan Fisika Al-Biruni     Open Access  
Jurnal NEUTRINO     Open Access  
Jurnal Online of Physics     Open Access  
Jurnal Pendidikan Fisika Indonesia (Indonesian Journal of Physics Education)     Open Access  
Jurnal Penelitian Fisika dan Aplikasinya     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kasuari : Physics Education Journal     Open Access  
La Rivista del Nuovo Cimento     Hybrid Journal  
Lasers in Surgery and Medicine     Hybrid Journal   (Followers: 1)
Latvian Journal of Physics and Technical Sciences     Open Access  
Letters in High Energy Physics     Open Access  
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Light : Science & Applications     Open Access   (Followers: 3)
Living Reviews in Computational Astrophysics     Open Access   (Followers: 3)
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access   (Followers: 1)
Lubrication Science     Hybrid Journal   (Followers: 2)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 5)
Machining Science and Technology: An International Journal     Hybrid Journal   (Followers: 2)
Magnetic Resonance     Open Access  
Magnetic Resonance Letters     Open Access  
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 3)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 31)
Matéria (Rio de Janeiro)     Open Access  
Materials and Design     Open Access   (Followers: 47)
Materials at High Temperatures     Full-text available via subscription   (Followers: 3)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 15)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Research Innovations     Hybrid Journal   (Followers: 1)
Materials Science     Hybrid Journal   (Followers: 7)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 44)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 22)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 15)
Materials Science and Technology     Hybrid Journal   (Followers: 40)
Materials Today Physics     Hybrid Journal   (Followers: 1)
Matériaux & Techniques     Full-text available via subscription   (Followers: 2)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mathematics and Mechanics of Solids     Hybrid Journal   (Followers: 3)
Matter and Radiation at Extremes     Open Access   (Followers: 1)
Meccanica     Hybrid Journal   (Followers: 1)
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 6)
Mechanics of Materials     Hybrid Journal   (Followers: 25)
Mechanics of Time-Dependent Materials     Hybrid Journal   (Followers: 2)
Mechanics Research Communications     Hybrid Journal   (Followers: 4)
Medical Physics     Hybrid Journal   (Followers: 17)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 11)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Instrumentation     Open Access   (Followers: 57)
Modern Physics Letters A     Hybrid Journal   (Followers: 14)

  First | 1 2 3 4 | Last

Similar Journals
Journal Cover
Journal of Superconductivity and Novel Magnetism
Journal Prestige (SJR): 0.32
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Partially Free Journal Partially Free Journal
ISSN (Print) 1557-1939 - ISSN (Online) 1557-1947
Published by Springer-Verlag Homepage  [2469 journals]
  • Ab Initio Calculations of Structural, Electronic, Elastic, Optical, and
           Dynamical Properties of Half-Heusler LiSiB Compound

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      Abstract: Abstract Structural, electrical, elastic, optical, and dynamical properties of LiSiB half-Heusler compound were analyzed based on density functional theory implemented in Quantum Espresso and ABINIT package programs. The effects of exchange–correlation interactions are handled by the generalized gradient approximation with Perdew-Burke-Ernzerhof parametrization. Firstly, the structure of this half-Heusler compound has been optimized and our results indicate that LiSiB reveals semiconducting behavior with an indirect band gap of 0.21 eV. The elastic constants, and other elastic modules have been computed. The mechanical stabilities of these alloys have been theoretically confirmed. The phonon dispersion spectra and phonon density of states in the Brillouin zone have been obtained and discussed. Also, the optical properties were calculated, and the results showed that the LiSiB alloy has a strong optical transition and the LiSiB crystal could be used in the design of optoelectronic devices. There are no results found on elastic, optical, and phonon features of LiSiB in the literature; hence, the findings reported here shed light on future studies.
      PubDate: 2022-05-21
       
  • 150-Degree Nonlinear Magnetic Oscillations in YIG Films

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      Abstract: Abstract Autoresonance is a new non-linear method for excitation of spin subsystem in magnetics by an extremely low magnetic field. Here, we consider the autoresonance (autophasing) process in a model of yttrium iron garnet (YIG) film possessing out-of-plane uniaxial anisotropy. As a result of simulation in MuMax3 software, the parameters of exciting field are determined and a model is proposed for successful auto-phase locking at GHz frequencies. The numerical data obtained for the model with material parameters close to ones for low-damping yttrium iron garnet films are in good agreement with theoretical predictions. It is shown that the process of phase locking leads to a soliton-like character of the excited magnetic oscillations with a high-amplitude of precession. The maximum angle of magnetization deflection reaches up to 150° at the exciting field of 1 mT sweeping with the rate 4.3 × 1016 s−2. It is presented the stability of the autoresonance in the case of low damping in the developed model. Besides, the damping could be used for adjusting the parameters of the autoresonance, which paves the way for potential experimental testing.
      PubDate: 2022-05-21
       
  • Variation of Junction Resistance Near Phase Transition of NdBa2Cu3O7-δ
           Superconductor in Ambegaokar–Baratoff and de Gennes Theories

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      Abstract: Abstract Junction resistance (RN) as a function of temperature (T) in bulk superconducting NdBa2Cu3O7-δ (NBCO) has been determined following the de Gennes (dG) and Ambegaokar–Baratoff (AB) theories. A convergence of RN (T) obtained by two theories is not impossible at a T which is below the critical temperature. Variation of RN (T) corresponding to the intergranular region is very sensitive to the T-dependence of the gap function (Δ). Moderate range of RN reveals that the junctions are SNS in nature. Within the framework of the dG theory, the influence of the correlation length (ξN) on RN has also been investigated. Also, a moderate junction resistance and nonlinear current–voltage (IV) together reveal that a resistive bulk pinning network may be existing near the superconducting phase transition region.
      PubDate: 2022-05-20
       
  • Growth, Structure, Micro-structure and Magneto-transport of an Easy Route
           Synthesized Bulk Polycrystalline TiSe2

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      Abstract: Abstract This article reports an easy route synthesis of bulk polycrystalline TiSe2. Phase purity and micro-structure are determined through powder X-ray diffraction (PXRD) and field emission scanning electron microscopy (FESEM) respectively. Vibrational modes of TiSe2 as being analyzed by Raman spectroscopy show the occurrence of both A1g and Eg modes. Charge density wave (CDW) is observed in transport measurements of TiSe2 with a hysteresis in cooling and warming measurements at around 180 K. Furthermore, studied TiSe2 showed negative magnetoresistance (MR) below the CDW and a small positive MR above the CDW.
      PubDate: 2022-05-20
       
  • Research on Impedance Balance Design and Optimization of Triaxial HTS
           Cable

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      Abstract: Abstract Superconducting power transmission is a new type of power transmission technology developed based on the characteristics of superconductors such as zero resistance and high current density. The triaxial structure is more compact and has great advantages in densely populated areas with limited transmission corridors. However, since its three-phase conductors are wound on the same former, their dimensions cannot be the same, resulting in three-phase unbalance. Three-phase unbalance causes differences in current distribution, resulting in a larger voltage difference between phases, which may reduce the current-carrying capacity of the cable. Therefore, the impedance balance design and optimization research of triaxial high-temperature superconducting (HTS) cable have important guiding significance for the development of large-capacity and long-distance superconducting cables. In this paper, the energized conductor is designed for the triaxial HTS cable, and the improved particle swarm algorithm is used for optimization research, and the optimization schemes of the three-phase single-layer and three-phase double-layer structures are compared. The reverse scheme of the single-layer structure can reduce the impedance unbalance to 1%, and the commutation scheme of the two-layer structure can reduce the impedance unbalance to 2% to achieve a three-phase impedance balance.
      PubDate: 2022-05-20
       
  • High Curie Temperature in (Fe/Cr)-doped Zincblende SnC Half-metal
           Ferromagnet: First-principles Study

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      Abstract: Abstract For the ultimate goal of adjusting the physical properties of the tin-carbide (SnC) semiconductor, a meticulous theoretical study based on density functional theory (DFT) and Korringa–Kohn–Rostoker (KKR) method combined with coherent potential approximation (CPA) on transition metals substitution is investigated. Iron (Fe) and chromium (Cr) ions have been chosen for their interesting magnetic properties (spin moment, Curie temperature). A value x corresponding to the substitution concentration is varied between 2% and 24% for both \(Sn_{1-x}Cr_{x}C\) and \(Sn_{1-x}Fe_{x}C\) compound types. All \(Sn_{1-x}Fe_{x}C\) compounds show a half-metallic ferromagnetic nature, while a similar behavior is also revealed for \(Sn_{1-x}Cr_{x}C\) compounds with x up to 12. Our self-consistent (SCF) spin-polarized calculations findings revealed that the main contributions to the net magnetization of our compound originate from Fe and Cr ions, with the partial spin moment of Fe is \(3.68\,\mu _{B}\) for \(24\%\) and is around \(2.4\,\mu _{B}\) for Cr. The mean field approximation indicates that the Curie temperature reaches its highest value of 502.86K for Fe at the x-value of 12% , whereas with Cr substitution, the greatest value of 712K is found at x=24%. These findings show that \(Sn_{1-x}Cr_{x}C\) and \(Sn_{1-x}Fe_{x}C\) compounds are promising for spintronics applications.
      PubDate: 2022-05-19
       
  • Phase Formation and Superconductivity of Nb3Al Bulk Materials Prepared by
           Spark Plasma Sintering and Powder Metallurgy

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      Abstract: Abstract Although various methods have been used to prepare Nb3Al superconducting materials to accelerate their commercialization, the preparation of Nb3Al by spark plasma sintering (SPS) is rarely reported. In this paper, Nb3Al superconductors were successfully prepared by SPS technology. By comparing with the traditional powder metallurgy (PM) method, the phase formation mechanism and superconducting properties of SPS-Nb3Al were investigated. The results show that the SPS-Nb3Al has a larger lattice constant similar to the high-temperature melt phase, and its lattice constant is very sensitive to the annealing treatment. It reveals that in SPS process, the local high temperature generated by plasma heating accelerates the formation of Nb3Al phase. In addition, the short reaction time and fast cooling make the Nb3Al grains small and tightly connected. The Al content in SPS-Nb3Al is relatively high, which results in a better superconductivity compared with the PM-Nb3Al.
      PubDate: 2022-05-19
       
  • Structure, Morphological, Magnetic, and Antibacterial Studies of Undoped
           and Ce/Mg-Doped NiO Nanoparticle Semiconductors Synthesized by Microwave
           Method

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      Abstract: Abstract The NiO and different concentrations of Ce/Mg-doped NiO were prepared by simple microwave method. For this synthesis, urea is added as a precursor material. The optical, magnetic, and antibacterial properties of the synthesized nanoparticles were investigated. The powdered XRD diffraction pattern gives the structural analysis and also the study revealed that the particles were multi polycrystalline nature. The HRTEM images show that the nanoparticles were homogeneous spherical particles. The UV–visible spectrum shows that while increasing the cerium doping concentration, the band gap energy also increases. The bacterial efficiency of the synthesized samples was analyzed by using Gram-positive and Gram-negative bacteria.
      PubDate: 2022-05-19
       
  • Phase Transitions in a Three-Dimensional Site-Diluted 5-State Potts Model

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      Abstract: Abstract The phase transitions in the 5-state 3d site-diluted Potts model are investigated by means of the computer simulation methods. We address systems with liner sizes L × L × L = N, L = 20 ÷ 160 at p = 1.00, 0.90, 0.85, and 0.80. Based on the analysis of the fourth-order Binder cumulants and the histogram data analysis, the position of the tricritical point at the phase diagram is determined.
      PubDate: 2022-05-18
       
  • Short-Range Ferromagnetic Order in Nd0.6Sr0.4-xKxMnO3
           (x = 0.2) Perovskite

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      Abstract: Abstract The structure, magnetic properties, and critical behavior of Nd0.6Sr0.2K0.2MnO3 compound are investigated. Rietveld refinement of the X-ray diffraction pattern shows that the examined sample is a pure single phase, crystallized in an orthorhombic Pnma structure. The nanometric size of crystallites calculated using Williamson-Hall method is validated by transmission electron microscopy micrographs. Magnetic measurements indicate a second-order ferromagnetic (FM)/paramagnetic (PM) transition at the Curie point Tc. Various techniques are used such as modified Arrott plot (MAP), Kouvel-Fisher method (KF), and critical isotherm analysis (CIA) to identify critical properties from isothermal magnetization data near critical regions. The deduced values are close to the 3D Ising model, proving the existence of a short-range ferromagnetic order in Nd0.6Sr0.2K0.2MnO3 sample. The results fully meet the requirements of the universal scaling assumption, further confirming its accuracy.
      PubDate: 2022-05-18
       
  • Elastocaloric Effect and Magnetic Properties of Ni50Mn31.5Ti18Cu0.5 Shape
           Memory Alloy

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      Abstract: Abstract The elastocaloric effect and magnetic performance of Ni50Mn31.5Ti18Cu0.5 shape memory alloy were studied. The analysis of magnetic transformation shows that the transformation temperature of the alloy is close to room temperature. A large unloading rate can make the alloy showing smaller hysteresis and lower plastic deformation, and improve the superplasticity of the alloy. With the increase in loading stress, the cooling effect of the alloy is better. When the loading stress is 600 MPa, the ΔT of the alloy reaches 9 K. The alloy has good cycle stability during 100 cycles. Hence, the refrigeration performance of Ni50Mn31.5Ti18Cu0.5 alloy can be compared with many Ni-Mn-based alloys, which indicates that it is a promising elastocaloric refrigeration material.
      PubDate: 2022-05-16
       
  • Crystal Structure and Magnetic Properties of Epitaxial Cobalt Thin Films
           and Single-Crystal Nanostrips Grown on a Stepped Surface
           Si(111)-5.55×5.55-Cu with a Cu(111) Buffer Layer

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      Abstract: Abstract Technological conditions under which a two-phase epitaxial thin film of Co is formed on a stepped surface of Si(111)-5.55×5.55-Cu with a buffer layer of Cu(111) and an ordered array of single-crystal nanostrips of hcp-Co with sharp interphase boundaries growing by self-organization were determined. The crystal structure of epitaxial thin films and single-crystal Co nanowires was deciphered by the diffraction methods. Magnetic anisotropy in epitaxial thin films and single-crystal nanostrips of Co was investigated. Using Kerr microscopy, the magnetization reversal modes in epitaxial thin films of Co were studied and discussed. The results presented shed light on the magnetic properties and domain structure depending on the crystal structure and geometry of magnetic nanomaterials promising for racetrack memory.
      PubDate: 2022-05-16
       
  • Enhancement of Coercivity in the P-Doped FePt Nanocrystalline Film
           Prepared by Electrodeposition

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      Abstract: Abstract In this work, the P-doped FePt films were successfully prepared by electrodeposition and subsequent annealing. Varied NaH2PO2•H2O was added to adjust the content of P in the FePtP film. Crystalline structure, morphologies in micro- and nano-scales, and magnetic property of FePtP films were investigated. The P doping significantly enhances the coercivity in the FePtP films. High coercivity of 23.8 kOe is achieved in the FePtP film with 22 at% P. The P doping promotes the formation of L10 FePt phase. Nonmagnetic Fe2P and PtP2 are formed by the P doping and segregate at grain boundary, which reduces the exchange coupling between magnetic particles. These two factors result in the enhancement of coercivity.
      PubDate: 2022-05-16
       
  • Entanglement Dynamics in the System of Two Spin-1/2 Particles with Ising
           Interaction and Time-Dependent Dzyaloshinskii-Moriya Interaction

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      Abstract: Abstract In this paper, the dynamics of the spin-1/2 Ising model with added DM interaction is studied. We assume DM interaction is a function of the time. We consider one of the Bell states as an initial state. The concurrence is used to analyze the entanglement between two spins. It is found that in the absence of the DM interaction, the entanglement maintains its maximum value. By raising DM interaction, the fluctuations of the entanglement increase. If the DM interaction varies with time, the dynamic behavior of the entanglement will be different. By increasing the amplitude of sinusoidal DM interaction, the entanglement fluctuations will be in the opposite phase in the short term. The combination of the constant and time-dependent DM interactions makes the system generates a series of entanglement revival and collapse phenomena over the time. Increasing the angular frequency of the DM interaction changes the order of the entanglement oscillations and strongly increases the oscillations’ speed.
      PubDate: 2022-05-14
       
  • Two La0.5Ag0.1Ca0.4MnO3 Manganite Nanoparticles Synthesized via Sol–Gel
           and Solid-State Methods–Structural, Magnetic, and Magnetocaloric
           Properties

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      Abstract: Abstract La0.5Ag0.1Ca0.4MnO3 manganite nanoparticles are synthesized via two different ways, namely, a solid-state reaction (S1) and the sol–gel process (S2). Their structural, magnetic, and magnetocaloric properties are reported. The powder X-ray diffraction (PXRD) and Rietveld refinement analyses confirm fully crystalline single-phase orthorhombic nanoparticles, even with different conditions of synthetic processes. Moreover, considering the magnetic phase transition of both samples through Banerjee’s criterion revealed a second-order paramagnetic–ferromagnetic phase transition. The influence of elaboration process on magnetic and magnetocaloric behaviors has been investigated. The solid-state sample exhibits a lower magnetic entropy change ( \(\Delta\)  SM) value in comparison to that obtained by sol–gel reaction. Besides, the effect of magnetoelastic coupling and electron interaction in magnetocaloric properties was evidenced via Landau theory.
      PubDate: 2022-05-13
       
  • Force Acting on a Superconducting Ball in an Axisymmetric Magnetic Field

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      Abstract: Abstract An analytical formula for the force acting on a spherical superconductor in an external axisymmetric magnetic field is obtained. Its application is illustrated by calculating the force of the action of the magnetic field of a circular loop with current on a superconducting ball.
      PubDate: 2022-05-12
       
  • Electron–Phonon Coupling Constant of Uranium and Lutetium

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      Abstract: Abstract According to the importance of electron–phonon interaction, we present an ab initio study of the electron–phonon coupling constant of two superconducting elements of periodic table. These values were calculated using density functional perturbation theory for uranium and lutetium, which are not available in the literatures. The electronic density of states peak that is around the Fermi energy and the sharp peaks in phonon dispersion curve are larger in magnitude for uranium, so the electron–phonon interaction in uranium is higher than that in lutetium. Then, we constructed a model by machine learning approach for 28 superconducting elements of the periodic table and chose the Debye and superconducting transition temperatures as descriptors features, to predict the electron–phonon coupling constants for uranium and lutetium. The absolute (relative) errors between the predicted by machine learning algorithm and density functional theory results of electron–phonon coupling constants are 0.01 (2%) and 0.13 (15%) for uranium and lutetium, respectively. This shows the power of the machine learning approach, which gives the results consistent with the density functional theory’s results.
      PubDate: 2022-05-12
       
  • Dielectric Constant, Exchange Bias, and Magnetodielectric Effect in
           CrO2/Cr2O3 Nanostructures

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      Abstract: Abstract The magnetodielectric effect has attracted considerable attention due to its intriguing physics and potential engineering applications in modern data storage, sensors, gyrators, and other novel low power electronic applications. Here, we investigate the dielectric behavior, exchange bias coupling, and magnetodielectric effect in nano-scaled CrO2/Cr2O3 core–shell structures. Importantly, our experiments have revealed interesting results whereupon the magnetodielectric effect and exchange bias coupling are strongly correlated in ferromagnetic and antiferromagnetic structures. It is notable that the magnetodielectric effect at room temperature can be enhanced from 1 to 3.5% with exchange bias coupling. Thus, the magnetodielectric effect is enhanced by as much as 250% with the assistance of exchange bias coupling. Results are interpreted here in terms of a spin-dependent transport model.
      PubDate: 2022-05-10
       
  • Numerical Analysis of the Effect of Temperature and External Stochastic
           Excitations on HTS Bulk’s Levitodynamics

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      Abstract: Abstract High-temperature superconducting (HTS) maglev, named as the most promising technology of the future transportation, has attracted more and more attention, especially on the dynamic characteristics. In practice, the temperature varying inside the bulk together with the irregularity of the permanent magnetic guideway (PMG) directly and simultaneously affects the levitation and guidance force. This paper takes the HTS bulk, liquid nitrogen (LN), and PMG into account to establish the two-dimensional magnetic-thermal-guideway coupled model by using COMSOL Multiphysics. In order to simulate the magnetic field fluctuation caused by the PMG’s arrangement irregularity, we add the test track irregularity spectrum of high-speed railway to the PMG. The temperature effect on levitation and guidance force is simulated and analyzed under four conditions of excitations as well as comparing with the model without considering the temperature. The results show that the temperature and coupling of excitations in both directions simultaneously affects the magnitude of levitation and guidance force, and the difference caused by above two factors is significant, which makes a better understanding of the relation between the force and temperature and provides an effective reference for the HTS bulk’s dynamic analysis.
      PubDate: 2022-05-06
       
  • Spin Structure Factors of Heisenberg Antiferromagnet on Two-Dimensional
           Lieb Nanolattice

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      Abstract: Abstract We have theoretically studied the spin structure factors of Heisenberg model on Lieb lattice in the presence of magnetic field along perpendicular to the plane and Dzyaloshinskii–Moriya interaction. The original spin model Hamiltonian is mapped to a bosonic model using a hard-core bosonic transformation. Under such transformation, an infinite hard-core repulsion is imposed to constrain one boson occupation per site. Based on Green’s function approach, the energy spectrum of quasiparticle excitation has been obtained. The spectrum of the bosonic gas has been implemented in order to obtain two-particle propagator which corresponds to spin structure factor of original Heisenberg chain model Hamiltonian. The results show the peak position in the dynamical transverse spin structure factor at fixed value for Dzyaloshinskii–Moriya interaction moves to higher frequency with enhancement of magnetic field. However, the intensity of peaks in dynamical transverse spin structure factor is not affected by magnetic field. Also the Dzyaloshinskii–Moriya interaction strength causes to increase the intensity of dynamical longitudinal spin structure factor. Also the increase in magnetic field causes to move the frequency position of peaks in dynamical longitudinal spin susceptibility toward low frequencies. Our results show static transverse structure factor is found to be monotonically decreasing with magnetic field. Moreover, a monotonic reduction behavior for temperature dependence of static spin susceptibility has been observed for temperature dependence at each value of Dzyaloshinskii–Moriya interaction strength.
      PubDate: 2022-05-06
       
 
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