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MA: Fachverband Magnetismus
MA 59: Spin Excitations II/ Spin Scattering
MA 59.3: Vortrag
Donnerstag, 17. März 2011, 17:45–18:00, HSZ 04
Unified ab initio description of the intrinsic and extrinsic anomalous Hall effect in disordered alloys — Diemo Ködderitzsch, •Kristina Chadova, Stephan Lowitzer, and Hubert Ebert — Ludwig-Maximilians-Universität München, Department Chemie und Biochemie, Physikalische Chemie, Butenandtstraße 11, D-81377 München, Germany
We present a coherent ab initio, i.e. parameter free, description of the anomalous Hall effect (AHE) that is applicable to pure as well as disordered alloy systems by treating all sources of the AHE on equal footing. We employ an implementation of the Kubo-Středa equation using the fully relativistic Korringa-Kohn-Rostoker (KKR) Green’s function method in conjunction with the Coherent Potential Approximation (CPA) alloy theory. Applications to the pure elemental ferromagnets bcc-Fe, hcp-Co and fcc-Ni lead to results in full accordance to previous ab initio studies determining the intrinsic contribution only. However, the power of the approach presented is the ability to explicitly treat also extrinsic contributions to the AHE which is demonstrated by an application to the fcc alloy systems FexPd1−x, CoxPd1−x and NixPd1−x. We obtain a very satisfying qualitative agreement with experiment over the whole concentration range including the sign reversal of the AH-conductivity. A detailed discussion of skew and side-jump scattering processes exemplifies the capability of the proposed method.