Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Poster II
MA 50.59: Poster
Freitag, 15. März 2013, 10:30–13:30, Poster D
Spin Hall and spin Nernst effect in dilute ternary alloys — •Katarina Tauber1, Dmitry Fedorov1, Martin Gradhand2, and Ingrid Mertig1,3 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2H.H. Wills Physics Laboratory, University of Bristol, United Kingdom — 3Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
We present an ab initio study of the spin Hall as well as the spin Nernst effect. Both refer to the creation of a transverse spin current caused by an applied electric field or a temperature gradient, respectively. For the considered Cu-based dilute alloys, the dominant skew scattering mechanism was analysed for several pairs of impurities. We investigated the dependence of the transport properties of ternary alloys on the relative concentration of the two types of impurities. The efficiency of all systems with respect to the spin current generation is discussed in detail. All calculations are based on a fully relativistic Korringa-Kohn-Rostoker method and solution of a linearized Boltzmann equation, successfully applied to the SHE [1] and SNE [2] in binary alloys. The considered ternary alloys appeared to be well described by Matthiessen's rule. However, for the Hall resistivity deviations from Matthiessen's rule can have both signs in contrast to the longitudinal resistivity with only positive deviations.
[1] M. Gradhand et al., Phys. Rev. Lett. 104, 186403 (2010).
[2] K. Tauber et al., Phys. Rev. Lett. 109, 026601 (2012).