Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.32: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Ab initio calculations on the Intrinsic Spin Hall effect — •Alexander Fabian, Michael Czerner, and Christian Heiliger — Institut für theoretische Physik, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen

Spintronic devices gain much attention for applications, since the additional spin degree of freedom can be used to manufacture even more efficient and faster devices. For such applications, a spin polarized current is neccessary. To generate such currents it is most suitable to use physical effects such as the Spin Hall effect. We show here the application of ab initio calculations in the framework of a full relativistic Korringa-Kohn-Rostoker density functional theory to describe the intrinsic Spin Hall effect in materials with strong spin orbit coupling. Whereas typical methods rely on the implementation of a semi-classical Boltzmann formalism in conjunction with an additional term resulting from the Berry curvature, we describe the intrinsic Spin Hall effect by only relying on the full relativistic Kohn-Sham-Dirac Hamiltonian, which evokes a spin orbit coupling in the material, and the non-equilibrium Greens function formalism. Within this framework it is possible to give a prediction of Spin Hall angles in different materials for use in applications. By expanding the method with scattering times and spin flip scattering it should be possible to also give a prediction of extrinsic Spin Hall effects as well. To prove the applicability of this method, the magnetization distribution of a thin film of a material with strong spin orbit coupling like Platinum is calculated under an applied bias voltage.