Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan.
Phys Rev Lett. 2012 Jan 6;108(1):017203. doi: 10.1103/PhysRevLett.108.017203. Epub 2012 Jan 5.
The performance of spintronic devices critically depends on three material parameters, namely, the spin polarization in the current (P), the intrinsic Gilbert damping (α), and the coefficient of the nonadiabatic spin transfer torque (β). However, there has been no method to determine these crucial material parameters in a self-contained manner. Here we show that P, α, and β can be simultaneously determined by performing a single series of time-domain measurements of current-induced spin wave dynamics in a ferromagnetic film.
自旋电子器件的性能严重依赖于三个材料参数，即电流中的自旋极化（P）、固有 Gilbert 阻尼（α）和非绝热自旋转移力矩系数（β）。然而，目前还没有一种方法可以完全确定这些关键的材料参数。在这里，我们展示了通过在铁磁薄膜中进行单个电流诱导自旋波动力学的时域测量系列，可以同时确定 P、α和β。
