Zobrazeno 1 - 10
of 185
pro vyhledávání: '"Umerski, A."'
Autor:
Fadeev, Valentin, Umerski, Andrey
In this communication we study the behaviour of spin current components in a ballistic junction consisting of two semi-infinite leads and a scattering region composed of two magnetic layers separated by a non-magnetic metallic spacer. We then conside
Externí odkaz:
http://arxiv.org/abs/2407.00214
Autor:
Fadeev, Valentin, Umerski, Andrey
In this communication we apply the Landauer method and transfer matrix formalism to the calculation of spin current in magnetic multilayered structures within a ballistic quantum-mechanical regime. The method provides an elegant and intuitive formali
Externí odkaz:
http://arxiv.org/abs/1906.06097
Publikováno v:
APL Materials, Vol 11, Iss 8, Pp 081108-081108-6 (2023)
Previous theory indicated that the individual monolayers within transition metal ferromagnet thin-films contribute different magnitudes to the total ferromagnetic damping. Here, the aim was to investigate if the thin-film damping could be reduced by
Externí odkaz:
https://doaj.org/article/8a9bd440db56484e9c94b31c844a8a0d
Autor:
Umerski, A.
We show, theoretically, that the phase of the interlayer exchange coupling (IEC) undergoes a topological change of approximately $2\pi$ as the chemical potential of the ferromagnetic (FM) lead moves across a hybridization gap (HG). The effect is larg
Externí odkaz:
http://arxiv.org/abs/1709.09525
A new physical mechanism for generating spin-transfer torque is proposed. It is due to interference of bias driven nonequilibrium electrons incident on a switching junction with the electrons reflected from an insulating barrier inserted in the junct
Externí odkaz:
http://arxiv.org/abs/1111.3196
Two alternative current-induced switching geometries, in which the current flows parallel to the magnet/nonmagnet interface, are investigated theoretically using the nonequilibrium Keldysh theory. In the first geometry, the current is perpendicular t
Externí odkaz:
http://arxiv.org/abs/0812.3346
Autor:
Cinal, M., Umerski, A.
The uniaxial in-plane magnetic anisotropy (UIP-MA) constant is calculated for a single step on the (001) surface of fcc Co($N$) films. The calculations are done for both an undecorated step and the step decorated with one or more, up to 7, Cu wires.
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511682
A selfconsistent theory of the current-induced switching of magnetization using nonequilibrium Keldysh formalism is developed for a junction of two ferromagnets separated by a nonmagnetic spacer. It is shown that the spin-transfer torques responsible
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407562
We make a theoretical study of the quantum oscillations of the tunneling magnetoresistance (TMR) as a function of the spacer layer thickness. Such oscillations were recently observed in tunneling junctions with a nonmagnetic metallic spacer at the ba
Externí odkaz:
http://arxiv.org/abs/cond-mat/0205185
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