Enhanced spin Hall effect by electron correlations in CuBi alloys
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195 (Japan)
- Institut Laue Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9 (France)
A recent experiment in CuBi alloys obtained a large spin Hall angle (SHA) of −0.24 (Niimi et al., Phys. Rev. Lett. 109, 156602 (2012)). We find that the SHA can be dramatically enhanced by Bi impurities close to the Cu surface. The mechanisms of this enhancement are two-fold. One is that the localized impurity state on surface has a decreased hybridization and combined with Coulomb correlation effect. The other comes from the low-dimensional state of conduction electrons on surface, which results in a further enhancement of skew scattering by impurities. Furthermore, we note that a discrepancy in sign of SHA between the experiment and previous theories is simply caused by different definitions of SHA. This re-establishes skew scattering as the essential mechanism underlying the spin Hall effect in CuBi alloys.
- OSTI ID:
- 22410079
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
A high-temperature ferromagnetic topological insulating phase by proximity coupling
Spin diffusion length and spin Hall angle in Pd1–xPtx/YIG heterostructures: Examination of spin relaxation mechanism