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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.53: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Non-equilbrium spin-orbit physics at high frequencies — •Hanan Hamamera, Filipe Souza Mendes Guimarães, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany

The field of spintronics is driven by the desire to develop new spin-based devices with performances surpassing the ones used in present-day technologies. It is then important to understand the ultrafast dynamical properties of such devices. This is challenging, as the electronic and spin dynamics have very different intrinsic time scales and simultaneously being intricately coupled — and so, they are best described by a unified theory. We build such a theory by parametrizing a realistic tight-binding hamiltonian based on first-principles electronic structure calculations, and then solving it for the real-time evolution of the system. We benchmark this approach with a simple model, meant to abstract the main features of the spin-polarized electronic structure. We then perform calculations for Co/Pt(001) and Fe/W(110) bilayers, and compare and contrast the results of the time-dependent approach with existing linear response ones [1]. This work was supported by the Palestinian-German Science Bridge BMBF program and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator Grant No. 681405-DYNASORE).
[1] F.S.M. Guimarães et al., Sci. Rep. 7, 3686 (2017)