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MA: Fachverband Magnetismus
MA 24: ThyssenKrupp Dissertations-Preis 2011 der AG Magnetismus
MA 24.2: Vortrag
Dienstag, 15. März 2011, 13:50–14:10, HSZ 04
The extrinsic and intrinsic Spin Hall effect from first principle — •Martin Gradhand1, Dmitry V. Fedorov2, Falko Pientka2, Peter Zahn2, Ingrid Mertig2,1, and Balazs L. Györffy3 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2Martin-Luther-Universität Halle, Institut für Physik, 06099 Halle, Germany — 3H.H.Wills Physics Laboratory, University of Bristol, United Kingdom
The Spin Hall effect, used for the creation of spin currents in nonmagnetic materials, is usually separated into extrinsic and intrinsic contributions. Whereas the extrinsic parts are induced by the scattering at impurities, the intrinsic mechanism is described by the Berry curvature of the ideal crystal. So far there exist ab initio calculations of the intrinsic part [1,2] and the extrinsic part [3] from separate methods and a Kubo formula approach including all parts in a compact manner [4].Here we present calculations of both contributions within one method based on the solution of a Boltzmann equation and a new way of computing the Berry curvature of Bloch waves within a relativistic Korringa-Kohn-Rostoker method [5]. With these methods and the consideration of the spin relaxation process we are able to identify systems ideally suited for a spintronics application. Those are dilute alloys combining a long spin diffusion length with a large spin Hall angle, that is, the most efficient conversion of the charge current into a spin current.
[1] G. Guo et al., PRL 100, 096401 (2008)
[2] Y. Yao et al., PRB 75, 020401(R) (2007)
[3] M. Gradhand et al., PRL 104, 186403 (2010)
[4] S. Lowitzer et al., PRL (accepted), (2010)
[5] M. Gradhand et al., PRB (to be submitted), (2011)