Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 59: Spin Excitations II/ Spin Scattering

MA 59.1: Vortrag

Donnerstag, 17. März 2011, 17:15–17:30, HSZ 04

Ab initio description of the spin-Hall effect in disordered ferromagnets — •Diemo Ködderitzsch, Stephan Lowitzer, and Hubert Ebert — Ludwig-Maximilians-Universität München, Department Chemie und Biochemie, Physikalische Chemie, Butenandtstraße 11, D-81377 München, Germany

Spin-orbit induced couplings are at the heart of interesting phenomena like the anomalous- and spin-Hall-effects (AHE, SHE), which recently received a lot of attention due to their potential application for spin-separating devices in the field of spintronics. During the last years several theoretical works have dealt with the intrinsic SHE, based on the band structure of pure materials and only a few of them use a parameter free ab initio approach.

We present a coherent ab initio description of the spin Hall effect that is applicable to pure and disordered alloys by treating all sources of the SHE on equal footing. We use an implementation of the Kubo-Středa equation employing the fully relativistic Korringa-Kohn-Rostoker (KKR) Green’s function method in conjunction with the Coherent Potential Approximation (CPA) alloy theory.

Whereas former studies concentrate mainly on non-magnetic systems, we apply our recently developed relativistic spin-projection scheme [1] to ferromagnetic transition-metal alloys and give first results.

[1] S. Lowitzer, D. Ködderitzsch and H. Ebert, Phys. Rev. B 82, 140402(R) (2010).