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    Angular dependence of spin-orbit spin-transfer torques

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    PhysRevB.91.144401.pdf
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    Description:
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    Type
    Article
    Authors
    Lee, Ki-Seung
    Go, Dongwook
    Manchon, Aurelien cc
    Haney, Paul M.
    Stiles, M. D.
    Lee, Hyun-Woo
    Lee, Kyung-Jin cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2015-04-06
    Permanent link to this record
    http://hdl.handle.net/10754/555699
    
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    Abstract
    In ferromagnet/heavy-metal bilayers, an in-plane current gives rise to spin-orbit spin-transfer torque, which is usually decomposed into fieldlike and dampinglike torques. For two-dimensional free-electron and tight-binding models with Rashba spin-orbit coupling, the fieldlike torque acquires nontrivial dependence on the magnetization direction when the Rashba spin-orbit coupling becomes comparable to the exchange interaction. This nontrivial angular dependence of the fieldlike torque is related to the Fermi surface distortion, determined by the ratio of the Rashba spin-orbit coupling to the exchange interaction. On the other hand, the dampinglike torque acquires nontrivial angular dependence when the Rashba spin-orbit coupling is comparable to or stronger than the exchange interaction. It is related to the combined effects of the Fermi surface distortion and the Fermi sea contribution. The angular dependence is consistent with experimental observations and can be important to understand magnetization dynamics induced by spin-orbit spin-transfer torques.
    Citation
    Angular dependence of spin-orbit spin-transfer torques 2015, 91 (14) Physical Review B
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.91.144401
    arXiv
    1409.5600
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevB.91.144401
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.91.144401
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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