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首页> 外文期刊>Physical review >Spin-orbit torques in Co/Pt(111) and Mn/W(001) magnetic bilayers from first principles
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Spin-orbit torques in Co/Pt(111) and Mn/W(001) magnetic bilayers from first principles

机译：从第一原理出发，Co / Pt（111）和Mn / W（001）磁性双层中的自旋轨道转矩

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摘要

An applied electric current through a space-inversion asymmetric magnet induces spin-orbit torques (SOTs) on the magnetic moments, which holds much promise for future memory devices. We discuss general Green's function expressions suitable to compute the linear-response SOT in disordered ferromagnets. The SOT can be decomposed into an even and an odd component with respect to magnetization reversal, where in the limit of vanishing disorder the even SOT is given by the constant Berry curvature of the occupied states, while the odd part exhibits a divergence with respect to disorder strength. Within this formalism, we perform first-principles density-functional theory calculations of the SOT in Co/Pt(111) and Mn/W(001) magnetic bilayers. We find the even and odd torque components to be of comparable magnitude. Moreover, the odd torque depends strongly on an additional capping layer, while the even torque is less sensitive. We show that the even torque is nearly entirely mediated by spin currents in contrast to the odd torque, which can contain an important contribution not due to spin transfer. Our results are in agreement with experiments, showing that our linear-response theory is well-suited for the description of SOTs in complex ferromagnets.
机译：通过空间反转非对称磁体施加的电流会在磁矩上感应出自旋轨道转矩（SOT），这为将来的存储设备提供了广阔前景。我们讨论适用于计算无序铁磁体中线性响应SOT的通用Green函数表达式。相对于磁化反转，SOT可以分解为偶数和奇数分量，其中在消失失调的极限下，偶数SOT由占据态的恒定Berry曲率给出，而奇数部分相对于磁化强度表现出发散无序强度。在这种形式主义中，我们对Co / Pt（111）和Mn / W（001）磁性双层中的SOT进行第一性原理密度泛函理论计算。我们发现偶数和奇数转矩分量具有可比较的大小。此外，奇数扭矩在很大程度上取决于附加的覆盖层，而偶数扭矩则不太敏感。我们显示，与奇数转矩相比，偶数转矩几乎完全由自旋电流介导，奇数转矩可以包含非自旋传递引起的重要贡献。我们的结果与实验相吻合，表明我们的线性响应理论非常适合描述复杂铁磁体中的SOT。

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  • 来源
    《Physical review》 |2014年第17期|174423.1-174423.10|共10页
  • 作者

    Frank Freimuth; Stefan Bluegel; Yuriy Mokrousov;

  • 作者单位

    Peter Gruenberg Institut and Institute for Advanced Simulation, Forschungszentrum Juelich and JARA, 52425 Juelich, Germany;

    Peter Gruenberg Institut and Institute for Advanced Simulation, Forschungszentrum Juelich and JARA, 52425 Juelich, Germany;

    Peter Gruenberg Institut and Institute for Advanced Simulation, Forschungszentrum Juelich and JARA, 52425 Juelich, Germany;

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  • 正文语种 eng
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  • 关键词

    spin polarized transport in metals; spin transport through interfaces;

    机译：在金属中旋转极化传输;通过接口旋转传输;

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