Low Temperature Physics: 41, 689 (2015); https://doi.org/10.1063/1.4931647
Fizika Nizkikh Temperatur: Volume 41, Number 9 (September 2015), p. 887-897    ( to contents , go back )

Landau–Lifschitz equations and spin dynamics in the heterostructure with broken inversion symmetry under spin-orbit torque transfer of spin moment

V.I. Korneev1, N.E. Kulagin2, A.F. Popkov1, and K.S. Sukmanova2

1Национальный исследовательский университет «МИЭТ» г. Москва, 124498, Зеленоград, проезд 4806, д. 5

2МАТИ – Российский государственный технологический университет им. К.Э. Циолковского ул. Оршанская, 3, г. Москва,121552, Россия
E-mail: klgn@yandex.ru
pos Анотація:

Received March 31, 2015

Abstract

The Landau–Lifschitz equations are generalized with due account for spin accumulations and localized spin dynamics in a conductive magnet in terms of the Rashba of spin-orbit scattering mechanism. The influence of spin-orbit torque transfer induced by longitudinal current flowing in a conductive heterostructure on its spin state is analyzed in the macrospin approximation on the basis of the modified Landau–Lifshitz equations. It is shown that depending on the geometry of structure magnetization it is possible as in the case of spin trans-fer torque transverse to the spin-valve structures, to realize switching modes of the spin in the easy-plane magnetic layer of the heterostructure. We construct examples of diagrams of spin states in the current–field plane, showing a satisfactory agreement with the results of experimental measurements of critical fields and switching currents in magnetic layers of asymmetric heterostructures Al2O3/Co/Pt and MgO/CoFeB/Ta, studied in M. Miron, L. Liu and co-workers.

PACS: 75.76.+j Spin transport effects;
PACS: 75.70.Tj Spin-orbit effects;
PACS: 75.75.–c Magnetic properties of nanostructures.

Key words: spin waves, incommensurate structures, multiferroics, magnonic crystals.

Published online: July 24, 2015

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