Theory of spin Hall magnetoresistance
Theory of spin Hall magnetoresistance
复制标题
DOI：
10.1103/physrevb.87.144411
复制
发表时间：
2013-04-12
影响因子：
3.7
通讯作者：
Bauer, Gerrit E. W.
中科院分区：
文献类型：
--
作者：
Chen, Yan-Ting;Takahashi, Saburo;Bauer, Gerrit E. W.
我们提出了由绝缘铁磁体F（如钇铁石榴石（YIG））和具有自旋轨道相互作用的正常金属N（如铂（Pt））制成的多层自旋霍尔磁阻（SMR）的理论。SMR是由自旋霍尔效应和逆自旋霍尔效应同时作用引起的，因此是一种非平衡接近现象。我们计算了F竖杆N和F竖杆N竖杆F层状体系的SMR，用自旋扩散理论和量子力学边界条件从自旋混合电导的角度对N进行了处理。我们的研究结果解释了实验观察到的N垂直棒F双层层的自旋霍尔磁阻。对于F垂直棒N垂直棒F自旋阀，我们预测当磁化共线时SMR振幅增强。这些三层膜中的SMR和自旋传递力矩可以通过磁结构来控制。DOI: 10.1103 / PhysRevB.87.144411
We present a theory of the spin Hall magnetoresistance (SMR) in multilayers made from an insulating ferromagnet F, such as yttrium iron garnet (YIG), and a normal metal N with spin-orbit interactions, such as platinum (Pt). The SMR is induced by the simultaneous action of spin Hall and inverse spin Hall effects and therefore a nonequilibrium proximity phenomenon. We compute the SMR in F vertical bar N and F vertical bar N vertical bar F layered systems, treating N by spin-diffusion theory with quantum mechanical boundary conditions at the interfaces in terms of the spin-mixing conductance. Our results explain the experimentally observed spin Hall magnetoresistance in N vertical bar F bilayers. For F vertical bar N vertical bar F spin valves we predict an enhanced SMR amplitude when magnetizations are collinear. The SMR and the spin-transfer torques in these trilayers can be controlled by the magnetic configuration. DOI: 10.1103/PhysRevB.87.144411