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MA: Fachverband Magnetismus

MA 4: Spin-dependent Transport Phenomena

MA 4.1: Vortrag

Montag, 26. März 2012, 09:30–09:45, H 1012

Extrinsic spin Hall effect in metallic films from first principles — •Christian Herschbach^1,2, Martin Gradhand³, Dmitry Fedorov^1,2, Peter Zahn², and Ingrid Mertig^1,2 — ¹Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Hall, Germany — ²Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany — ³H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TH, United Kingdom

We present ab initio calculations of the skew scattering contribution to the spin Hall effect for free-standing fcc Au(111) films with sub- stitutional Pt impurities. Their thickness is varied between 1 and 32 monolayers. The calculated spin Hall angle changes drastically as a function of impurity position within the film. We show that adatoms play a special role. In particular, they cause a sign change of the spin Hall angle. Moreover, Pt adatoms on a 1 monolayer Au film give rise to a drastic enhancement of the spin Hall angle.