Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Ultrafast magnetization effects and magnetization dynamics

MA 2.10: Vortrag

Montag, 1. April 2019, 12:00–12:15, H37

Electron dynamics driving ultrafast magnetization dynamics in alloys — •Sebastian T. Weber1, Benjamin Stadtmüller1,2, Moritz Hofherr1,2, Martin Aeschlimann1, and Baerbel Rethfeld11Department of Physics and Research Center Optimas, TU Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany

Irradiating ferromagnetic films with an ultrashort laser pulse leads to a quenching of the magnetization on a subpicosecond timescale [1]. Our spin-resolved Boltzmann description allows to describe the out-of-equilibrium electrons and their microscopic collision processes [2].

Recent experiments in an exchange coupled ferromagnetic Fe-Ni alloy (Permalloy) have revealed element-specific dynamics right after the optical excitation [3]. To reveal the mechanisms responsible, we have set up a model to trace the spin-resolved electron dynamics in dependence on both magnetic sublattices of the alloy. Our results show the influence of the involved coupling mechanisms on the different relaxation processes.

[1] E. Beaurepaire et al., PRL 76, 4250 (1996)
B. Y. Mueller et al., PRL 111, 167204 (2013)
S. Mathias et al., PNAS 109, 4792 (2012)

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