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Giant Spin Hall Effect Induced by Skew Scattering from Bismuth Impurities inside Thin Film CuBi Alloys

2012; American Physical Society; Volume: 109; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.109.156602

1092-0145

Yasuhiro Niimi, Yuji Kawanishi, Dahai Wei, C. Deranlot, Hongxin Yang, Mairbek Chshiev, Thierry Valet, A. Fert, Y. Otani,

Physics of Superconductivity and Magnetism

We demonstrate that a giant spin Hall effect (SHE) can be induced by introducing a small amount of Bi impurities in Cu. Our analysis based on a new 3-dimensional finite element treatment of spin transport shows that the sign of the SHE induced by the Bi impurities is negative and its spin Hall (SH) angle amounts to -0.24. Such a negative large SH angle in CuBi alloys can be explained by applying the resonant scattering model proposed by Fert and Levy [Phys. Rev. Lett. 106, 157208 (2011)] to 6p impurities.