Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Ultrafast magnetism II
MA 11.5: Vortrag
Montag, 12. März 2018, 16:00–16:15, EB 407
Modelling of spin-resolved ARPES experiments on ultra-fast demagnetisation on the basis of the one-step model of photo-emission — •Voicu Popescu1, Jan Minàr2, Jürgen Braun1, and Hubert Ebert1 — 1Department Chemie, Ludwig Maximilian University, Munich, Germany — 2University of West Bohemia, New Technologies Research Centre, Plzeň, Czech Republic
The ultra-fast demagnetisation caused by a strong laser pulse was investigated recently by Eich et al. [1] by spin and angle-resolved photo emission (ARPES) experiments on the elemental ferromagnet Co [1]. To interpret the dependence of the observed effective exchange splitting on the delay time of this pump-probe experiment two different models were considered: the first one assumes a plain reduction of the exchange splitting in the spirit of the Stoner model, while the second one accounts for a magnon-mediated band-mirroring subsequent to the excitation. The experimental data seem to favour the second model. The present contribution seeks to check this interpretation of the experimental data by performing ARPES calculations for ferromagnetic Fe and Co using the one-step model of photo-emission within the framework of the spin-polarised relativistic Korringa-Kohn-Rostoker method. To allow for a rather direct comparison with experiment both scenarios were modelled as close as possible. The discussion of the resulting ARPES spectra is accompanied by an analysis of the underlying electronic structure.
[1] S. Eich et al. Science Advances 3, e1602094 (2017)