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Regensburg 2016 – wissenschaftliches Programm

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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 Mathias41Forschungszentrum 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.

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