Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Magnetization / Demagnetization Dynamics II
MA 35.10: Vortrag
Mittwoch, 18. März 2015, 17:30–17:45, EB 301
Competition between ultrafast spin transport and spin-flip scattering investigated by complex femtosecond time-resolved MOKE — Jens Wieczorek1, •Andrea Eschenlohr1, Boris Weidtmann1, Malte Rösner2, Andreas Duvenbeck1, Nicolas Bergeard1, Alexander Tarasevitch1, Tim O. Wehling2, and Uwe Bovensiepen1 — 1Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen — 2Institute for Theoretical Physics, University of Bremen, and Bremen Center for Computational Materials Science
We analyze femtosecond laser-induced magnetization dynamics of epitaxial Co/Cu(001) films via ultrafast changes in the polarization rotation and ellipticity of the complex magneto-optical Kerr effect (MOKE). By exploiting the effective depth sensitivity of this experimental method, we conclude on a time- and depth-dependent magnetization profile, which is qualitatively different for ultrafast spin transport and spin-flip scattering. We find that before hot electron thermalization (<100 fs) the ultrafast demagnetization of Co/Cu(001) is dominated by spin-dependent transport, while local spin-flip processes govern the magnetization dynamics after thermalization.
We acknowledge funding from the DFG through SFB 616, the BMBF through Grant 05K10PG2 FemtospeX, and the Mercator Research Center Ruhr through Grant PR-2011-0003.