Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Spin-dependent Transport Phenomena

MA 4.2: Vortrag

Montag, 26. März 2012, 09:45–10:00, H 1012

Investigation of the extrinsic spin Hall effect in transition metal alloys — •K Chadova, D Ködderitzsch, and H Ebert — Universität München, Department Chemie, Butenandtstr. 5-13, D-81377 München

The extrinsic spin Hall effect (SHE) can be controlled by manipulating the concentration of impurities or by changing the impurity and host materials. In the present work we investigate the extrinsic SHE in transition metal alloys in the dilute limit from first principles. The calculations were performed by using the fully relativistic Korringa-Kohn-Rostoker (KKR) Green's function method in combination with the Coherent Potential Approximation (CPA) alloy theory on the basis of the Kubo-Streda equation.

A large extrinsic SHE is observed when the spin-orbit coupling (SOC) strength of the impurity is substantially different from the host. The magnitude of the calculated extrinsic SHE is found to scale approximately with the ratio of SOC of impurity and the host materials. In particular, we observe a sign change in the extrinsic spin Hall conductivity for some impurities. The latter depends on the relation between SOC strengths of the host and the impurtity. These results are found in a reasonable agreement with available experimental data.