SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session III: Poster to Mini-Symposium: Ultrafast surface dynamics at the space-time limit I
O 41.1: Poster
Dienstag, 2. März 2021, 10:30–12:30, P
Microscopic theory for the real-time magnetization dynamics in bilayer-surfaces driven by ultrafast laser pulses — •Hanan Hamamera1, Filipe Souza Mendes Guimaraes2, Manuel dos Santos Dias1, and Samir Lounis1,3 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany — 2Jülich Supercomputing Centre, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany — 3Faculty of Physics, University of Duisburg-Essen, 47053 Duisburg, Germany
We study the ultrafast magnetic reversal of spin moments by a single laser pulse [1] from a microscopic point of view.
This is done by employing a realistic tight-binding Hamiltonian parameterized from density functional theory calculations to describe the real-time evolution of the electronic states.
We map the parameter space characterizing the magnetic reversal of bulk Ni by the applied laser pulse, explaining the underlying physics and dissecting various intertwined spin-dynamics regimes.
The knowledge gained on Ni is then utilized to explore the case of bilayer surfaces such as Co/Pt(001), where the non-magnetic heavy-metal substrate provides additional channels for angular momentum dissipation via spin and orbital pumping mechanisms, as well as stronger spin-orbital conversion.
Work funded by the Palestinian-German Science Bridge (BMBF–01DH16027) and Horizon 2020–ERC (CoG 681405–DYNASORE).
[1] J. Gorchon et al., Appl. Phys. Lett. 111, 042401 (2017)