Spin-orbit torques in two-dimensional Rashba ferromagnets
Spin-orbit torques in two-dimensional Rashba ferromagnets
复制标题
DOI：
10.1103/physrevb.92.014402
复制
发表时间：
2015-07-06
影响因子：
3.7
通讯作者：
Titov, M.
中科院分区：
文献类型：
--
作者：
Qaiumzadeh, A.;Duine, R. A.;Titov, M.
如果自旋轨道耦合足够强，单畴铁磁体中的磁化动力学可以由电荷电流触发。我们应用泛函Keldysh理论研究了自旋相关无序下金属二维Rashba铁磁体的自旋-轨道矩。一个反应性的，antidamping-like自旋-轨道扭矩以及耗散，类场扭矩计算微观上，领先的自旋-轨道相互作用强度的顺序。通过计算第一顶点修正，我们表明，除非散射率是自旋相关的，否则内在的反阻尼力矩消失。
Magnetization dynamics in single-domain ferromagnets can be triggered by a charge current if the spin-orbit coupling is sufficiently strong. We apply functional Keldysh theory to investigate spin-orbit torques in metallic two-dimensional Rashba ferromagnets in the presence of spin-dependent disorders. A reactive, antidamping-like spin-orbit torque as well as a dissipative, field-like torque is calculated microscopically, to leading order in the spin-orbit interaction strength. By calculating the first vertex correction we show that the intrinsic antidamping-like torque vanishes unless the scattering rates are spin dependent.