Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.8: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Magnetization dynamics in laser-excited alloys
— •Sebastian T. Weber, Sanjay Ashok, Johan Briones, and Baerbel Rethfeld — Department of Physics and Research Center Optimas, University of Kaiserslautern, Erwin Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

Irradiating ferromagnetic films with an ultrashort laser pulse leads to a quenching of the magnetization on a subpicosecond timescale [1]. With the help of a spin-resolved Boltzmann description, which allows to describe microscopic collision processes including spin-flips, we have identified the equilibration of chemical potentials of majority and minority electrons as a driving force for ultrafast magnetization dynamics [2].

Since the discovery of ultrafast demagnetization, a multitude of questions and challenges arised. One of the heavily discussed topics is the element-specific dynamics in exchange coupled ferromagnetic alloys [3]. We calculate the joint and partial density of states using DFT methods. The results are put into kinetic simulations [2] and temperature-based descriptions [4]. Here, we want to extend existing models, to trace the electron dynamics with spin-resolution and in dependence on the material in the alloy.

[1] E. Beaurepaire et al., PRL 76, 4250 (1996)
[2] B. Y. Mueller et al., PRL 111, 167204 (2013)
[3] S. Mathias et al., PNAS 109, 4792 (2012)
[4] B. Y. Mueller et al., PRB 90, 14420 (2014)