论文标题
磁性多层的界面上的广义磁电回路理论和自旋松弛
Generalized magnetoelectronic circuit theory and spin relaxation at interfaces in magnetic multilayers
论文作者
论文摘要
金属接口处的自旋传输是各种自旋装置概念的重要组成部分，例如巨型磁力，自旋转移扭矩和旋转泵送。自旋轨道耦合在许多此类设备中起着重要作用。特别是，由于自旋轨道耦合，自旋电流在界面被部分吸收。我们开发了一般的磁电路电路理论，并概括了自旋混合电导的概念，从而考虑了负责自旋弹性散射的各种机制。对于特殊情况，当交换相互作用占主导地位时，我们就造成自旋松弛（即自旋记忆损失），自旋扭矩和自旋进动的贡献来为自旋混合电导提供一个简单的表达。旋转内存损耗参数$δ$与自旋流传输和反射概率有关。旋转扭矩和自旋记忆丧失之间没有直接的关系。我们使用Landauer-Büttiker方法计算N | N，F | N，F | F接口的自旋散射速率，并使用电路理论确定$δ$的值。
Spin transport at metallic interfaces is an essential ingredient of various spintronic device concepts, such as giant magnetoresistance, spin-transfer torque, and spin pumping. Spin-orbit coupling plays an important role in many such devices. In particular, spin current is partially absorbed at the interface due to spin-orbit coupling. We develop a general magnetoelectronic circuit theory and generalize the concept of the spin mixing conductance, accounting for various mechanisms responsible for spin-flip scattering. For the special case when exchange interactions dominate, we give a simple expression for the spin mixing conductance in terms of the contributions responsible for spin relaxation (i.e., spin memory loss), spin torque, and spin precession. The spin-memory loss parameter $δ$ is related to spin-flip transmission and reflection probabilities. There is no straightforward relation between spin torque and spin memory loss. We calculate the spin-flip scattering rates for N|N, F|N, F|F interfaces using the Landauer-Büttiker method within the linear muffin-tin orbital method and determine the values of $δ$ using circuit theory.
