Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.22: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Electron dynamics driving ultrafast magnetization dynamics in itinerant ferromagnets and alloys — •Sebastian Weber and Baerbel Rethfeld — Fachbereich Physik und Forschungszentrum OPTIMAS, TU Kaiserslautern, Germany

Irradiating ferromagnetic films with an ultrashort laser pulse leads to a quenching of the magnetization on a subpicosecond timescale [Beaurepaire et al., PRL 76, 4250 (1996)]. 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 [Mueller et al., NJP 13, 123010 (2011) and PRL 111, 167204 (2013)].

Recent experiments have revealed element-specific dynamics in exchange coupled ferromagnetic alloys [Mathias et al., PNAS 109, 4792 (2012)]. We set up a microscopic model to trace the electron dynamics with spin-resolution and in dependence on the material in the alloy.