Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 31: Magnetization and Demagnetization Dynamics II
MA 31.9: Vortrag
Mittwoch, 9. März 2016, 11:45–12:00, H34
Time- and Spin-resolved Photoemission Study of the Ultrafast Demagnetization Process in thin Co Films using High-order Harmonic Generation — •Moritz Plötzing1, Markus Rollinger2, Steffen Eich2, Sebastian Emmerich2, Roman Adam1, Cong Chen3, Henry Kapteyn3, Margaret Murnane3, Lucasz Plucinski1, Benjamin Stadtmüller2, Mirko Cinchetti2, Martin Aeschlimann2, Claus Schneider1, and Stefan Mathias4 — 1Forschungszentrum Jülich GmbH, Peter Grünberg Insitut 6, 52425 Jülich, Germany — 2TU Kaiserslautern and Research Center OPTIMAS, 67663 Kaiserslautern, Germany — 3JILA, University of Colorado and NIST, Boulder, Colorado 80309-0440, USA — 4Georg-August-Universität Göttingen, I. Physikalisches Institut, 37077 Göttingen, Germany
A powerful experimental technique that promises to provide novel information on the ultrafast demagnetization mechanisms is the direct mapping of the time evolution of the electronic band structure using spin-resolved photoelectron spectroscopy. Our approach combines a bright, femtosecond pulsed extreme ultraviolet (XUV) light source optimized for photoemission with a state-of-the-art spin detector and allows a direct, energy-resolved observation of the electron- and spin-dynamics over the full valence bands of 3d-ferromagnets after optical excitation. We present our experimental setup as well as results of the laser-induced, ultrafast demagnetization in thin Co films. Moreover, we discuss possible underlying mechanisms, e.g. a reduction of the exchange splitting or a spin-mixing, on the basis of our observations.