Giant Extrinsic Spin Hall Effect due to Rare-Earth Impurities

Details Giant Extrinsic Spin Hall Effect due to Rare-Earth Impurities Giant Extrinsic Spin Hall Effect due to Rare-Earth Impurities

2008-08-11

arxiv.org/abs/0808.1459v2

New J. Phys. 11 (2009) 013023

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, to be published in New Journal of Physics

Scientific paper

10.1088/1367-2630/11/1/013023

We investigate the extrinsic spin Hall effect in the electron gas model due to magnetic impurities, by focusing on Ce- and Yb-impurities. In the dilute limit, the skew scattering term dominates the side jump term. For Ce-impurities, the spin Hall angle $\alpha_{\rm SH}$ due to skew scattering is given by $-8\pi\sin\delta_2/7$, where $\delta_2 (\ll 1)$ is the phase shift for$d (l=2)$ partial wave. Since $\alpha_{\rm SH}$ reaches $O(10^{-1})$ if $\delta_2 \simge 0.03$, the spin Hall effect is anticipated to be considerable in metals with rare-earth impurities. The giant extrinsic SHE originates from the large orbital angular momentum, which is also significant for the intrinsic SHE.

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