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Spin-orbit torques from interfacial spin-orbit coupling for various interfaces

Title
Spin-orbit torques from interfacial spin-orbit coupling for various interfaces
Authors
Kim, Kyoung-WhanLee, Kyung-JinSinova, JairoLee, Hyun-WooStiles, M. D.
POSTECH Authors
Lee, Hyun-Woo
Date Issued
Sep-2017
Publisher
AMER PHYSICAL SOC
Abstract
We use a perturbative approach to study the effects of interfacial spin-orbit coupling in magnetic multilayers by treating the two-dimensional Rashba model in a fully three-dimensional description of electron transport near an interface. This formalism provides a compact analytic expression for current-induced spin-orbit torques in terms of unperturbed scattering coefficients, allowing computation of spin-orbit torques for various contexts, by simply substituting scattering coefficients into the formulas. It applies to calculations of spin-orbit torques for magnetic bilayers with bulk magnetism, those with interface magnetism, a normal-metal/ferromagnetic insulator junction, and a topological insulator/ferromagnet junction. It predicts a damping like component of spin-orbit torque that is distinct from any intrinsic contribution or those that arise from particular spin relaxation mechanisms. We discuss the effects of proximity-induced magnetism and insertion of an additional layer and provide formulas for in-plane current, which is induced by a perpendicular bias, anisotropic magnetoresistance, and spin memory loss in the same formalism.
Keywords
TOPOLOGICAL INSULATOR; DOMAIN-WALLS; MAGNITUDE; TRANSPORT; SYSTEMS
URI
http://oasis.postech.ac.kr/handle/2014.oak/50544
DOI
10.1103/PhysRevB.96.104438
ISSN
2469-9950
Article Type
Article
Citation
PHYSICAL REVIEW B, vol. 96, no. 10, page. 104438, 2017-09
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