Crystal field effects on spin pumping
Crystal field effects on spin pumping
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DOI：
10.1103/physrevb.96.144434
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发表时间：
2017-10-26
影响因子：
3.7
通讯作者：
Bauer, Gerrit E. W.
中科院分区：
文献类型：
--
作者：
Cahaya, Adam B.;Leon, Alejandro O.;Bauer, Gerrit E. W.
“自旋泵浦”是通过时间相关的磁化将自旋角动量注入到与自旋混合电导成比例的相邻普通金属中。我们研究了晶体场形式的静电相互作用对泵浦自旋电流的作用，该泵浦自旋电流是由绝缘体在金属界面处具有交换耦合局部矩而产生的。晶体场显示出使自旋电流各向异性，这意味着绝缘体 | 的自旋混合电导正常的金属双层取决于晶体切割和取向。我们根据普通金属中接近引起的平衡自旋密度的相干运动来解释界面“有效场”（自旋混合电导的虚部）。
"Spin pumping" is the injection of spin angular momentum by a time-dependent magnetization into an adjacent normal metal proportional to the spin mixing conductance. We study the role of electrostatic interactions in the form of crystal fields on the pumped spin currents generated by insulators with exchange-coupled local moments at the interface to a metal. The crystal field is shown to render the spin currents anisotropic, which implies that the spin mixing conductance of insulator | normal metal bilayers depends on crystal cut and orientation. We interpret the interface "effective field" (imaginary part of the spin mixing conductance) in terms of the coherent motion of the equilibrium spin density induced by proximity in the normal metal.