Roles of nonlocal conductivity on spin Hall angle measurement
Roles of nonlocal conductivity on spin Hall angle measurement
复制标题
非局域电导率对自旋霍尔角测量的作用
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Shufeng Zhang
中科院分区：
文献类型：
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作者：
Kai Chen;Shufeng Zhang
自旋霍尔角表征了自旋-电荷电流转换的速率，已成为自旋电子学物理和器件应用的重要材料参数之一。一个长期存在的争议是，通过自旋泵浦和自旋霍尔扭矩实验测量的给定材料的自旋霍尔角是不一致的，它们可能相差一个数量级。利用线性响应自旋输运理论，给出了不同实验条件下自旋霍尔角与测量变量之间的关系式。我们发现，层状结构中继承的非局域电导对解决自旋霍尔角的fl值起着关键作用。我们提供了一种从实验数据中提取自旋输运系数fi因子的通用方案。
Spin Hall angle characterizes the rate of spin-charge current conversion and it has become one of the most important material parameters for spintronics physics and device application. A long-standing controversy is that the spin Hall angles for a given material measured by spin pumping and by spin Hall torque experiments are inconsistent and they could differ by as much as an order of magnitude. By using the linear response spin transport theory, we explicitly formulate the relation between the spin Hall angle and measured variables in different experiments. We find that the nonlocal conductivity inherited in the layered structure plays a key role to resolve conflicting values of the spin Hall angle. We provide a generalized scheme for extracting spin transport coefficients from experimental data.