Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Ultrafast Magnetization III

MA 30.7: Talk

Wednesday, March 18, 2020, 11:15–11:30, HSZ 101

Mutual influence of relaxation processes in exchange coupled magnetic alloys — •Sebastian T. Weber and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern,

Irradiating ferromagnetic films with an ultrashort laser pulse leads to a quenching of the magnetization on a subpicosecond timescale. The laser-pulse drives the electrons out of equilibrium, which starts a chain reaction of different relaxation processes.

We reveal the different mechanism responsible for the magnetization dynamics and their interplay. We have set up a model [1] to trace the spin-resolved electron dynamics in dependence on different states of the magnetization process. So far, the model needed multiple phenomenological parameters. In this talk, we present our approach to reduce the amount of those parameters.

[1] B. Y. Mueller und B. Rethfeld, Phys. Rev. B 90, 144420 (2014)