Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 5: Magnetization/Demagnetization Dynamics

MA 5.5: Talk

Monday, March 20, 2017, 10:30–10:45, HSZ 401

Electron dynamics driving ultrafast magnetization dynamics in itinerant ferromagnets and alloys — •Sebastian Weber 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 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].
Recent experiments have revealed element-specific dynamics in exchange coupled ferromagnetic alloys [3]. We set up a microscopic model to trace the electron dynamics with pin-resolution and in dependence on the material in the alloy. We show first results of the interplay between relaxation processes.
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)