Extrinsic Spin Hall Effect Induced by Iridium Impurities in Copper
Extrinsic Spin Hall Effect Induced by Iridium Impurities in Copper
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DOI：
10.1103/physrevlett.106.126601
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发表时间：
2011-03-22
影响因子：
8.6
通讯作者：
Otani, Y.
中科院分区：
文献类型：
--
作者：
Niimi, Y.;Morota, M.;Otani, Y.
我们通过从横向自旋阀结构向 CuIr 线注入纯自旋电流，研究了 Cu 中 Ir 杂质引起的外在自旋霍尔效应。虽然在没有 Ir 杂质的情况下没有观察到自旋霍尔效应，但 CuIr 的自旋霍尔电阻率随杂质浓度线性增加。 CuIr 的自旋霍尔角在 1% 到 12% 的浓度范围内为 (2.1 +/- 0.6)%，实际上与温度无关。这些结果代表了非磁性合金中自旋霍尔效应的主要偏斜散射外在贡献的明显例子。
We study the extrinsic spin Hall effect induced by Ir impurities in Cu by injecting a pure spin current into a CuIr wire from a lateral spin valve structure. While no spin Hall effect is observed without Ir impurity, the spin Hall resistivity of CuIr increases linearly with the impurity concentration. The spin Hall angle of CuIr, (2.1 +/- 0.6)% throughout the concentration range between 1% and 12%, is practically independent of temperature. These results represent a clear example of predominant skew scattering extrinsic contribution to the spin Hall effect in a nonmagnetic alloy.