Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.10: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Ultrafast magnetization dynamics in thin Co films studied by spin-resolved photoelectron spectroscopy with XUV pulses from HHG — •Sebastian Emmerich1, Moritz Plötzing2, Steffen Eich1, Markus Rollinger1, Roman Adam2, Cong Chen3, Henry Kapteyn3, Margret Murnane3, Benjamin Stadtmüller1, Mirko Cinchetti1, Martin Aeschlimann1, Stefan Mathias1,4, and Claus Schneider2 — 1University of Kaiserslautern and Research Center OPTIMAS, Kaiserslautern, Germany — 2Forschungszentrum Jülich GmbH, Peter Grünberg Institut, Jülich, Germany — 3JILA and NIST, University of Colorado, Boulder, USA — 4Georg-August-Universität Göttingen, I. Physikalisches Institut, Göttingen, Germany
We combine a bright 10 kHz high-order harmonic generation light source with an exchange scattering-based spin detector to investigate ultrafast magnetization dynamics in thin Co films. We map the spin-resolved band structure dynamics over the full valence band energy during the ultrafast demagnetization process following photo-excitation with a 1.57 eV pump pulse. We observe a >50% quenching of the spin polarization within the first 50 fs after the optical excitation, which is simultaneously occurring over the whole energy range. This finding gives strong evidence that the initial ultrafast demagnetization dynamics of the valence band in thin Co films is dominated by spin-mixing processes. A reduction of the exchange splitting, as expected in the Stoner model, is not observed.