Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.97: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Gigantic spin Hall effect in Au caused by interstitial impurities — •Martin Gradhand1, Dmitry V. Fedorov2, Christian Herschbach2, Peter Zahn2, and Ingrid Mertig2,1 — 1Max-Planck-Institut fär Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2Martin-Luther-Universität Halle, Institut für Physik, 06099 Halle, Germany
The gigantic spin Hall effect (SHE) observed in Au [1] two years ago is still not fully understood. Several proposals such as a Kondo resonance on Fe impurities [2], a quantum renormalization of the SHE [3], Pt impurities on the thin Au [4] film were discussed in the literature. Among them, as was discussed in Ref. [3], the explanation with the Kondo resonance has been questioned already both theoretically and experimentally.
Meanwhile our fully relativistic ab initio calculation [5] showed that C and N substitutional impurities in Au should provide large spin Hall angle comparable to the experimentally found one. However, a practical realization of such stable substitutional alloys is quite questionable. Here we present a study of the skew scattering mechanism in gold caused by interstitial impurities such as C, N, and Ar. With this study we propose a new possibility for the gigantic SHE.
[1] T. Seki et al., Nature Mater. 7, 125 (2008)
[2] G. Guo et al., PRL 102, 036401 (2009)
[3] B. Gu et al., PRL 105, 086401 (2010)
[4] B. Gu et al., PRL 105, 216401 (2010)
[5] M. Gradhand et al., PRL 104, 186403 (2010)