Enhancement of Current-Induced Out-of-Plane Spin Polarization by Heavy-Metal-Impurity Doping in Fe Thin Films
Enhancement of Current-Induced Out-of-Plane Spin Polarization by Heavy-Metal-Impurity Doping in Fe Thin Films
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DOI：
10.1103/physrevapplied.16.054001
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发表时间：
2021-11
影响因子：
4.6
通讯作者：
T. Yokouchi;Y. Shiomi
中科院分区：
文献类型：
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作者：
T. Yokouchi;Y. Shiomi
磁体中的电流诱导自旋极化最近引起了人们的极大关注，因为与多晶非磁性重金属相反，磁体中允许面外自旋极化。我们利用磁圆二向色性研究了电流感生的离面自旋极化与杂质掺杂的关系。电流诱导的面外自旋极化被清楚地观察到，并归因于反常的自旋轨道扭矩，其中由自旋霍尔效应引起的自旋轨道扭矩影响表面的磁矩，产生面外自旋极化。值得注意的是，电流诱导的离面自旋极化随着浓度的增加而显著增强，具有大的自旋-轨道相互作用的杂质诱导了非本征自旋霍尔效应，从而增强了反常的自旋-轨道扭矩。我们的结果为加强磁体中电流诱导的自旋极化提供了指导原则。
Current-induced spin polarization in magnets has recently attracted much attention because out-of-plane spin polarization is allowed, as opposed to polycrystalline nonmagnetic heavy metals. We investigate the-impurity-doping dependence of current-induced out-of-plane spin polarization inthin films with the use of magnetocircular dichroism. Current-induced out-of-plane spin polarization is clearly observed and attributed to anomalous spin-orbit torque, in which the spin-orbit torque induced by the spin Hall effect inacts on the magnetic moments ofat the surfaces, generating out-of-plane spin polarization. Notably, current-induced out-of-plane spin polarization is significantly enhanced with increasingconcentration.impurities with a large spin-orbit interaction induce the extrinsic spin Hall effect of, and consequently, the anomalous spin-orbit torques are enhanced. Our results provide a guiding principle for strengthening current-induced spin polarization in magnets.