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Angular dependence of spin-orbit spin-transfer torques

机译:自旋轨道自旋传递扭矩的角度依赖性

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摘要

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.
机译:在铁磁体/重金属双层中,面内电流会产生自旋轨道自旋传递扭矩,该扭矩通常分解为像场和类似阻尼的扭矩。对于具有Rashba自旋轨道耦合的二维自由电子和紧束缚模型,当Rashba自旋轨道耦合变得可与交换相互作用进行比较时,类似磁场的转矩将获得对磁化方向的非平凡依赖。场转矩的这种非平凡的角度依赖性与费米表面畸变有关,费米表面畸变由Rashba自旋轨道耦合与交换相互作用之比确定。另一方面,当Rashba自旋轨道耦合与交换相互作用相当或更强时,类似阻尼的扭矩将获得非平凡的角度依赖性。它与费米表面畸变和费米海贡献的综合作用有关。角度相关性与实验观察结果一致,对于理解由自旋轨道自旋传递扭矩引起的磁化动力学可能非常重要。

著录项

  • 来源
    《Physical review》 |2015年第14期|144401.1-144401.8|共8页
  • 作者单位

    Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea;

    PCTP and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea;

    Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;

    Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    PCTP and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea;

    Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea,KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 136-713, Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanoelectronic devices; spin polarized transport;

    机译:纳米电子器件;自旋极化传输;

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