Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Spin-Dynamics / Spin-Torque IV
MA 35.5: Vortrag
Donnerstag, 26. März 2009, 16:15–16:30, HSZ 04
Experimental check of the Elliott-Yafet model in laser-induced ultrafast demagnetization — •Tobias Roth1, Daniel Steil1, Sabine Alebrand1, Bert Koopmans2, Grégory Malinowski2, Francesco Dalla Longa2, Daniel Steiauf3, Manfred Fähnle3, Mirko Cinchetti1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Department of Applied Physics, center for NanoMaterials (cNM), Eindhoven University of Technology, The Netherlands — 3Max-Planck-Institut für Metallforschung Stuttgart, Germany
The deep interest in the area of femtosecond magnetism results both from the very fundamental physical question about the involved interactions between light, spin, and matter and from the fact that magnetization dynamics on an ultrafast time scale may serve as a potential candidate for the future of data processing. In 2005 B. Koopmans et al. proposed an Elliott-Yafet (EY) type spin-flip process to be the responsible mechanism for the observed loss in magnetic order [1,2]. The model is based on electron-phonon or electron-impurity interaction whereby each scattering event carries a spin-flip probability to end up in a changed spin state. In this contribution we present time resolved magnetooptical Kerr measurements in the high perturbation regime that check the validity of the EY type spin-flip process by changing external key parameters. The results will be discussed behind the background of the model's predictions. [1] B. Koopmans et al., PRL 95 267207 (2005) [2] M. Cinchetti et al., PRL 97 177201 (2006)