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首页> 外文期刊>Advanced Functional Materials >Unveiling the Mechanism of Bulk Spin-Orbit Torques within Chemically Disordered Fe_xPt_(1-x) Single Layers
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Unveiling the Mechanism of Bulk Spin-Orbit Torques within Chemically Disordered Fe_xPt_(1-x) Single Layers

机译：揭示化学无序Fe_XPT_（1-X）单层体内散装旋转轨道扭矩的机制

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摘要

The recent discovery of spin-orbit torques (SOTs) within magnetic single-layers has attracted attention. However, it remains elusive as to how to understand and how to tune the SOTs. Here, utilizing the single layers of chemically disordered FexPt1-x, the mechanism of the "unexpected" bulk SOTs is unveiled by studying their dependence on the introduction of a controlled vertical composition gradient and temperature. The bulk dampinglike SOT is found to arise from an imbalanced internal spin current that is transversely polarized and independent of the magnetization orientation. The torque can be strong only in the presence of a vertical composition gradient. The SOT efficiency per electric field is insensitive to temperature but changes sign upon reversal of the orientation of the composition gradient, which is analog to the strain behaviors. These characteristics suggest that the imbalanced internal spin current originates from a bulk spin Hall effect and that the associated inversion asymmetry that allows for a non-zero net torque is most likely a strain non-uniformity induced by the composition gradient. The fieldlike SOT is a relatively small bulk effect compared to the dampinglike SOT. This study points to the possibility of developing low-power single-layer SOT devices by strain engineering.
机译：最近发现磁性单层内的旋转轨道扭矩（Sots）引起了注意力。但是，它仍然难以理解以及如何调整SOTS。这里，利用单层化学紊乱的FEXPT1-X，通过研究它们对引入受控垂直组合物梯度和温度的依赖性来推出“意外”散装SOTS的机制。发现散装阻尼的SOT从不平衡的内部旋转电流产生，该内部旋转电流横向偏振并且与磁化方向无关。扭矩仅在垂直组合物梯度的存在下才能强。每个电场的SOT效率对温度不敏感，但在逆转组合物梯度的逆转时改变符号，这是与应变行为的类似物。这些特性表明，不平衡内部旋转电流来自散装旋转霍尔效应，并且允许非零净扭矩的相关反转不对称性很可能是由组合物梯度引起的应变不均匀性。与湿度的SOT相比，Fieldlike SOT是一种相对较小的散装效果。本研究指出了通过应变工程开发低功率单层SOT设备的可能性。

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