Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
Phys Rev Lett. 2014 May 16;112(19):197201. doi: 10.1103/PhysRevLett.112.197201. Epub 2014 May 15.
We have investigated spin pumping from Y3Fe5O12 thin films into Cu, Ag, Ta, W, Pt, and Au with varying spin-orbit coupling strengths. From measurements of Gilbert damping enhancement and inverse spin Hall signals spanning 3 orders of magnitude, we determine the spin Hall angles and interfacial spin mixing conductances for the six metals. The spin Hall angles largely vary as Z(4) (Z: atomic number), corroborating the role of spin-orbit coupling. Amongst the four 5d metals, the variation of the spin Hall angle is dominated by the sensitivity of the d-orbital moment to the d-electron count, confirming theoretical predictions.
我们研究了 Y3Fe5O12 薄膜向 Cu、Ag、Ta、W、Pt 和 Au 的自旋注入，这些金属的自旋轨道耦合强度不同。通过对跨越 3 个数量级的 Gilbert 阻尼增强和反自旋霍尔信号的测量，我们确定了这六种金属的自旋霍尔角和界面自旋混合电导率。自旋霍尔角的变化很大程度上与 Z(4)（Z：原子序数）有关，这证实了自旋轨道耦合的作用。在这四种 5d 金属中，自旋霍尔角的变化主要由 d 轨道磁矩对 d 电子数的敏感性决定，这与理论预测相符。
