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Spin-transfer torque in ferromagnetic bilayers generated by anomalous Hall effect and anisotropic magnetoresistance

机译:异常霍尔效应和各向异性磁阻在铁磁双层中的自旋转移扭矩

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摘要

We propose an experimental scheme to determine the spin-transfer torque efficiency excited by the spin-orbit interaction in ferromagnetic bilayers from the measurement of the longitudinal magnetoresistace. Solving a diffusive spin-transport theory with appropriate boundary conditions gives an analytical formula of the longitudinal charge current density. The longitudinal charge current has a term that is proportional to the square of the spin-transfer torque efficiency and that also depends on the ratio of the film thickness to the spin diffusion length of the ferromagnet. Extracting this contribution from measurements of the longitudinal resistivity as a function of the thickness can give the spin-transfer torque efficiency.
机译:我们提出了一种实验方案,通过测量纵向磁阻来确定由铁磁双层中的自旋轨道相互作用激发的自旋传递扭矩效率。求解具有适当边界条件的扩散自旋传输理论,可得出纵向电荷电流密度的解析公式。纵向充电电流的项与自旋传递转矩效率的平方成正比,并且还取决于膜厚度与铁磁体的自旋扩散长度的比率。从作为厚度的函数的纵向电阻率的测量值中提取该贡献可以给出自旋传递扭矩效率。

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