Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 3: Spin Hall Effects

MA 3.9: Talk

Monday, March 31, 2014, 11:30–11:45, HSZ 403

Spin Hall and spin Nernst effect in 5d transition-metal thin films — •N. H. Long, P. Mavropoulos, B. Zimmermann, D. S. G. Bauer, S. Blügel, and Y. Mokrousov — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Spin Hall effect (SHE), where a transverse spin current is created in a nonmagnetic metal by an applied electrical field has developed into one of the most effective ways for spin-manipulation in nano-devices. In the nonmagnetic transition-metal alloys, one important contribution to the SHE is the skew-scattering due to impurities. A similar phenomenon, namely, the spin Nernst effect (SNE), has also been theoretically predicted and studied during the past years. Instead of applying an electric field, a transverse spin current can be produced by an applied temperature gradient via the SNE. Using our newly developed relativistic full-potential KKR Green function method, in this work we investigate the extrinsic SHE and SNE in 5d transition-metal thin films caused by the skew-scattering off adatom impurities. The conductivity tensor is calculated in terms of the Boltzmann equation at the dilute impurity concentration. The analysis is concentrated on the role played by the electronic structure of thin films as well as the surface states on the SHE and SNE. The calculated results allow the prediction of the emergence of large spin Hall as well as spin Nernst conductivities in these materials. We acknowledge funding from SPP 1538 SpinCaT programme and HGF-YIG Programme VH-NG-513.