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首页> 外文期刊>Physical review >Large extrinsic spin Hall effect in Au-Cu alloys by extensive atomic disorder scattering
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Large extrinsic spin Hall effect in Au-Cu alloys by extensive atomic disorder scattering

机译：大量原子无序散射在金铜合金中产生大的外在自旋霍尔效应

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摘要

Spin Hall angle, which denotes the conversion efficiency between spin and charge current, is a key parameter in the pure spin current phenomenon. The search for materials with large spin Hall angle is indeed important for scientific interest and potential application in spintronics. Here the large enhanced spin Hall effect (SHE) of Au-Cu alloy is reported by investigating the spin Seebeck effect, spin Hall anomalous Hall effect, and spin Hall magnetoresistance of the Y_3Fe_5O_(12) (YIG)/Au_xCu_(1-x) hybrid structure over the full composition. At the near equiatomic Au-Cu composition with maximum atomic disorder scattering, the spin Hall angle of the Au-Cu alloy increases by two to three times together with a moderate spin diffusion length in comparison with Au. The longitudinal spin Seebeck voltage and the spin Hall magnetoresistance ratio also increase by two to three times. More importantly, no evidence of anomalous Hall effect is observed in all YIG/Au-Cu samples, in contrast to the cases of other giant SHE materials Pt(Pd), Ta, and W. This behavior makes Au-Cu free from any suspicion of the magnetic proximity effect involved in the hybrid structure, and thus the Au-Cu alloy can be an ideal material for pure spin current study.
机译：自旋霍尔角表示自旋电流和充电电流之间的转换效率，是纯自旋电流现象的关键参数。对于自旋电子学中的科学兴趣和潜在应用而言，寻找具有大自旋霍尔角的材料确实很重要。通过研究Y_3Fe_5O_（12）（YIG）/ Au_xCu_（1-x）的自旋塞贝克效应，自旋霍尔异常霍尔效应和自旋霍尔磁阻来报告Au-Cu合金的大增强自旋霍尔效应（SHE）混合结构的全部组成。与Au相比，在具有最大原子无序散射的接近等原子的Au-Cu成分处，Au-Cu合金的自旋霍尔角增加了2-3倍，并且自旋扩散长度适中。纵向自旋塞贝克电压和自旋霍尔磁阻比也增加了2到3倍。更重要的是，与其他巨型SHE材料Pt（Pd），Ta和W的情况相比，在所有YIG / Au-Cu样品中均未观察到异常霍尔效应的证据。这种行为使Au-Cu毫无怀疑。由于混合结构中的磁性邻近效应的存在，因此Au-Cu合金可以成为纯自旋电流研究的理想材料。

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  • 来源
    《Physical review》 |2016年第1期|014422.1-014422.6|共6页
  • 作者

    L. K. Zou; S. H. Wang; Y. Zhang; J. R. Sun; J. W. Cai; S. S. Kang;

  • 作者单位

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    School of Physics, Shandong University, Jinan 250100, People's Republic of China;

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