Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Spin-Dynamics / Spin-Torque IV

MA 35.7: Vortrag

Donnerstag, 26. März 2009, 16:45–17:00, HSZ 04

Calculation of ultrafast demagnetization following laser excitation — •Sabine Alebrand, Michael Krauss, Tobias Roth, Daniel Steil, Mirko Cinchetti, Hans Christian Schneider, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany

In this presentation, we investigate a model for optically induced ultrafast magnetization dynamics in ferromagnets. In our approach we include electron-electron (and electron-phonon) scattering processes and a simplified spin-split electronic band structure. In this model, Elliott-Yafet type spin-flip scattering between electrons, and electrons and phonons leads to the demagnetization after optically excitation. The total spin-polarization dynamics can be compared with experiments, such as time resolved magneto optical Kerr measurements. For magnetic metals, such as Co and Ni, we find that calculated fluence dependence of the demagnetization dynamics reproduces experimental trends.