Reorientable Spin Direction for Spin Current Produced by the Anomalous Hall Effect
Reorientable Spin Direction for Spin Current Produced by the Anomalous Hall Effect
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DOI：
10.1103/physrevapplied.9.064033
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发表时间：
2018-06-20
影响因子：
4.6
通讯作者：
Ralph, Daniel C.
中科院分区：
文献类型：
--
作者：
Gibbons, Jonathan D.;MacNeill, David;Ralph, Daniel C.
我们的实验表明，自旋-轨道相互作用所产生的自旋电流的自旋方向内的铁磁层可以重新取向，通过转动该层的磁化方向。我们通过测量交换偏置的Fe Gd-95（5）薄膜产生的自旋轨道力矩的类场分量并作用于附近的Co 40 Fe 40 B20层来实现这一点。Co 40 Fe 40 B20和Fe 95 Gd 5磁矩的相对角度通过施加外部磁场而变化。我们发现，由此产生的扭矩是在良好的协议与预测，从Fe 95 Gd 5层的异常霍尔效应产生的自旋电流取决于Fe 95 Gd 5的磁化方向（m）在帽（FeGd）根据（σ）在右箭头正比于（（y）在帽。(m)过帽（FeGd））（m）过帽（FeGd），其中（y）过帽是垂直于所施加的充电电流的平面内方向。由于这种角度依赖性，由反常霍尔效应引起的自旋-轨道扭矩在样品几何形状中可以是非零的，对于该样品几何形状，由非磁性材料产生的自旋霍尔扭矩是相同的零。
We show experimentally that the spin direction of the spin current generated by spin-orbit interactions within a ferromagnetic layer can be reoriented by turning the magnetization direction of this layer. We do this by measuring the fieldlike component of spin-orbit torque generated by an exchange-biased Fe Gd-95(5) thin film and acting on a nearby Co40Fe40B20 layer. The relative angle of the Co40Fe40B20 and Fe95Gd5 magnetic moments is varied by applying an external magnetic field. We find that the resulting torque is in good agreement with predictions that the spin current generated by the anomalous Hall effect from the Fe95Gd5 layer depends on the Fe95Gd5 magnetization direction (m) over cap (FeGd) according to (sigma) over right arrow proportional to ((y) over cap.(m) over cap (FeGd))(m) over cap (FeGd), where (y) over cap is the in-plane direction perpendicular to the applied charge current. Because of this angular dependence, the spin-orbit torque arising from the anomalous Hall effect can be nonzero in a sample geometry for which the spin Hall torque generated by nonmagnetic materials is identically zero.