Current-Induced Spin-Torque Resonance of Magnetic Insulators

We formulate a theory of the ac spin Hall magnetoresistance in a bilayer system consisting of a magnetic insulator such as yttrium iron garnet and a heavy metal such as platinum. We derive expressions for the dc voltage generation based on the drift-diffusion spin model and quantum mechanical boundary condition at the interface that reveal a spin-torque ferromagnetic resonance (ST-FMR). We predict that ST-FMR experiments will reveal valuable information on the current-induced magnetization dynamics of magnetic insulators and the ac spin Hall effect.

我们建立了一种关于双层系统中交流自旋霍尔磁电阻的理论，该双层系统由诸如钇铁石榴石之类的磁性绝缘体和诸如铂之类的重金属组成。我们基于漂移 - 扩散自旋模型以及界面处的量子力学边界条件推导出了直流电压产生的表达式，这些表达式揭示了自旋 - 扭矩铁磁共振（ST - FMR）。我们预测，ST - FMR实验将揭示有关磁性绝缘体中电流诱导的磁化动力学以及交流自旋霍尔效应的有价值信息。