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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 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.