论文标题
自旋霍尔磁路的微观理论
Microscopic Theory of the Spin Hall Magnetoresistance
论文作者
论文摘要
我们考虑了旋转厅磁磁性（SMR）的微观理论。我们通常就旋转敏感性在正常金属和磁性绝缘体之间的界面上制定自旋电导。我们揭示了SMR由静态和动态部件组成。静态部分几乎独立于温度，源自由界面交换耦合引起的自旋翻转。但是，由木元素的创造或歼灭引起的动态部分具有与静态部分相反的符号。通过自旋波近似，我们预测后者会导致在有限温度下SMR信号的非平凡符号变化。此外，我们得出了自旋电导与热自旋噪声之间的onsager关系。
We consider a microscopic theory for the spin Hall magnetoresistance (SMR). We generally formulate a spin conductance at an interface between a normal metal and a magnetic insulator in terms of spin susceptibilities. We reveal that SMR is composed of static and dynamic parts. The static part, which is almost independent of the temperature, originates from spin flip caused by an interfacial exchange coupling. However, the dynamic part, which is induced by the creation or annihilation of magnons, has an opposite sign from the static part. By the spin-wave approximation, we predict that the latter results in a nontrivial sign change of the SMR signal at a finite temperature. In addition, we derive the Onsager relation between spin conductance and thermal spin-current noise.
