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Investigation of quantum and thermal fluctuations ferromagnetic spin chains with easy-plane anisotropy.
J Phys Condens Matter
August 2019
School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
One-dimensional ferromagnetic S = 1/2 and S = 1 spin chains with easy-plane and easy-axis exchange anisotropy are studied by the double-time Green's function method. The XYZ model can be used to describe several chain systems as the ferromagnetic spin chain of [Formula: see text] (CHAB). Alternatively, ferromagnetic spin-spirals with Dzyaloshinsky-Moriya interaction.
View Article and Find Full Text PDFUltra-efficient spin-orbit torque induced magnetic switching in W/CoFeB/MgO structures.
Nanotechnology
August 2019
Fert Beijing Institute, BDBC, School of Microelectronics, Beihang University, Beijing, People's Republic of China. Centre de Nanosciences et de Nanotechnologies, Université Paris-Sud, Université Paris-Saclay, 91120 Palaiseau, France.
Spin-orbit torque (SOT) induced magnetic switching in heavy metal/ferromagnet structures with perpendicular magnetic anisotropy (PMA) is promising for energy efficient spintronic devices. Here, we studied the SOT induced magnetic switching in perpendicular W/CoFeB/MgO structures. We demonstrated the critical current density for the SOT induced switching is as low as 1.
View Article and Find Full Text PDFEffects of the Dzyaloshinsky-Moriya interaction on nonequilibrium thermodynamics in the XY chain in a transverse field.
Phys Rev E
August 2018
School of Physics, Peking University, Beijing 100871, China.
We examine the effects of the Dzyaloshinsky-Moriya (DM) interaction on the nonequilibrium thermodynamics in an anisotropic XY spin chain, which is driven out of equilibrium by a sudden quench of the control parameter of the Hamiltonian. By analytically evaluating the statistical properties of the work distribution and the irreversible entropy production, we investigate the influences of the DM interaction on the nonequilibrium thermodynamics of the system with different parameters at various temperatures. We find that depending on the anisotropy of the system and the temperature, the DM interaction may have different impacts on the nonequilibrium thermodynamics.
View Article and Find Full Text PDFPeculiar magnetism in Eu substituted BiFeO and its correlation with local structure.
J Phys Condens Matter
October 2018
Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan.
We have systematically investigated the effects of Eu substitution on chemical pressure, bond lengths, microstrain, bond angles, octahedral tilting, vibrational modes and phase transformation, in BiFeO. Correlation between concentration, phase, local structure and magnetism has been explained. Substitution of Eu ions with contrasting magnetic moment and dissimilar size, affects the local structure by changing bond angles and hence modifies spin structure through weakening of Dzyaloshinsky-Moriya (DM) interaction which lead to destruction of spiral spin configuration.
View Article and Find Full Text PDFLow-energy spin dynamics of orthoferrites AFeO (A = Y, La, Bi).
J Phys Condens Matter
June 2018
Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea. Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
YFeO and LaFeO are members of the rare-earth orthoferrites family with Pbnm space group. Using inelastic neutron scattering, the low-energy spin excitations have been measured around the magnetic Brillouin zone center. Splitting of magnon branches and finite magnon gaps (∼2 meV) are observed for both compounds, where the Dzyaloshinsky-Moriya interactions account for most of this gap with some additional contribution from single-ion anisotropy.
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