由反常霍尔效应和各向异性磁阻产生的铁磁双层膜中的自旋转移矩。
Spin-transfer torque in ferromagnetic bilayers generated by anomalous Hall effect and anisotropic magnetoresistance.
作者信息
Taniguchi Tomohiro, Grollier Julie, Stiles M D
机构信息
National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Ibaraki 305-8568, Japan.
Unité Mixte de Physique CNRS/Thales and Université Paris Sud 11, 1 Avenue Fresnel, 91767 Palaiseau, France.
出版信息
Proc SPIE Int Soc Opt Eng. 2016;9931. doi: 10.1117/12.2235822. Epub 2016 Nov 4.
Abstract
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.
摘要
我们提出了一种实验方案，通过测量纵向磁阻来确定铁磁双层中自旋轨道相互作用激发的自旋转移矩效率。求解具有适当边界条件的扩散自旋输运理论，得到纵向电荷电流密度的解析公式。纵向电荷电流有一项与自旋转移矩效率的平方成正比，并且还取决于铁磁体的薄膜厚度与自旋扩散长度之比。从纵向电阻率随厚度变化的测量中提取这一贡献，可以得到自旋转移矩效率。
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