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Inverse spin Hall effect in Au_xTa_(1-x) alloy films

机译：Au_xTa_（1-x）合金薄膜的逆自旋霍尔效应

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摘要

Gold (Au) and tantalum (Ta) metals are two important spin Hall materials with diametrically different crystalline structure, resistivity, and spin Hall angle. By vapor quenching, Au_xTa_(1-x) alloys of different crystalline and amorphous structures, stable and metastable, have been formed over the entire composition range. We have studied the inverse spin Hall voltage induced by the longitudinal spin Seebeck effect in Au_xTa_(1-x) alloy films. We have found that the inverse spin Hall voltage ∆V_(ISHE), resistivity p, and the spin Hall angle θ_(SH) vary smoothly with composition. Both the spin Hall angle: and the spin Hall conductivity exhibit a quasilinear dependence on composition in the concentrated alloy regime, despite drastic differences in other properties. As corroborated by first-principles calculation, we show that the contribution to spin Hall effect in Au_xTa_(1-x) alloy is dominated by the number of valence electrons. We also show that the magnetoresistance correlates with the spin Hall angle.
机译：金（Au）和钽（Ta）金属是两种重要的自旋霍尔材料，具有完全不同的晶体结构，电阻率和自旋霍尔角。通过蒸气淬火，已经在整个组成范围内形成了稳定且亚稳态的不同晶体和非晶结构的Au_xTa_（1-x）合金。我们研究了Au_xTa_（1-x）合金薄膜中由纵向自旋塞贝克效应引起的自旋霍耳逆电压。我们发现，逆自旋霍尔电压∆V_（ISHE），电阻率p和自旋霍尔角θ_（SH）随成分而平滑变化。尽管在其他特性上存在巨大差异，但自旋霍尔角和自旋霍尔电导率在浓合金状态下均表现出对成分的准线性依赖性。正如第一性原理所证实的那样，我们表明，Au_xTa_（1-x）合金对自旋霍尔效应的贡献主要由价电子数决定。我们还表明，磁阻与自旋霍尔角相关。

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  • 来源
    《Physical review》 |2018年第2期|024402.1-024402.8|共8页
  • 作者

    D. Qu; S. Y. Huang; G. Y. Guo; C. L. Chien;

  • 作者单位

    Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA;

    Department of Physics, National Taiwan University, Taipei 10617, Taiwan;

    Department of Physics, National Taiwan University, Taipei 10617, Taiwan,Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan,Center for Theoretical Physics, National Taiwan University, Taipei 10617, Taiwan;

    Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA;

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