Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Magnetization/Demagnetization Dynamics

MA 5.5: Vortrag

Montag, 20. März 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.
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