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Spin Dynamics in Magnetic Heterostructures Driven by Current-Induced Spin-Orbit Torques

100%
Kulagin N., Korneev V., Popkov A., Demin G.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
463-465
EN
In this work it is shown that in magnetic heterostructure with the structural inversion symmetry due to the presence of the Rashba effective field responsible for the effects of spin-orbit scattering, the spin dynamics in the magnetic layer is described by a modified system of coupled equations for the exchange-coupled localized spins and spin accumulation. As a result, this system is reduced to an effective Landau-Lifshitz equation for the total magnetization with the additional torques which act similarly to the spin transfer torque in magnetic tunnel junction. Based on these equations, we calculated numerically the field dependences of the switching current density for the different magnetization geometries, in particular for that was used in work of Miron et al., which are in a good agreement with the experimental results for the reasonable fitting parameters.
2
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Edge Pinning Effects and Giant Thermal Instability of Magnetization Hysteresis Loops in Thin Nano-Scale Magnets

100%
Popkov A., Savchenko L., Vorotnikova N.
Acta Physica Polonica A
|
2000
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vol. 97
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issue 3
499-502
EN
Magnetization reversal modes of super-thin nano-scale particles with a high magnetization and low anisotropy are analyzed by solving magnetic moment motion equations. A new kind of thermal hysteresis instability connected with the random mutual transformation of the main magnetization modes is predicted by simulations.
3
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Magnetic Topological Structures in Multiferroics

100%
Gareeva Z., Zvezdin K., Popkov A., Zvezdin A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
380-383
EN
In this article we focus on impact of micromagnetic structures on magnetoelectricity of multiferroics. We discuss physical mechanisms of magnetoelectric coupling considering domain walls and spin cycloids. We review the progress on multiferroic materials focusing on high temperature multiferroic: rare earth iron garnet and bismuth ferrite. We argue that topological structures play a pivotal role in multiferoics and show that electric control of magnetism can be carried out via spin spirals and domain walls. Magnetic domain walls produce ferroelectricity in rare earth iron garnets; transformations of spin cycloids release magnetoelectricity in bismuth ferrite. Ferroic orders couple via magnetic inhomogeneities, which shed new light on fundamental physics and applications.
4
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Magnetoelastic and Optical Studies of Low Temperature Magnetic Relaxation in Rare-Earth Orthoaluminates with Ising Ions

88%
Krynetskii I., Popkov A., Borowiec M., Szymczak H., Zayarnyuk T.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
889-892
EN
The new class of magnetic materials with low temperature magnetic relaxation was studied. It was evidenced that the crystal DyAlO_{3} with antiferromagnetically ordered high anisotropy rare-earth ions showed an exponential magnetic relaxation. For the first time low temperature magnetic relaxation was investigated by means of magnetostriction and rare-earth optical absorption spectra instead of standard magnetization measurements. The possible mesoscopic nature of tunneling process was suggested.
5
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Structural Transformations and Magnetic Changes in Multiferroic BiFeO₃ under External Electric Field

88%
Soloviov S., Popkov A., Kulagin N., Sukmanova K., Zvezdin A.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 2
245-247
EN
The influence of electric field on the structure parameters and magnetic states in BiFeO₃ multiferroic is studied using the Landau theory of phase transitions taking into account experimental data and results of ab initio calculations. Main features of structure transitions near critical electric fields and a concomitant rearrangementof the magnetic structure are discussed.
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