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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.7: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Femtosecond demagnetization of Nickel/Gold: rotation vs ellipticity — •Moritz Barkowski, Oliver Schmitt, Jurij Urbancic, Steffen Eich, Jingyi Mao, Sakshath Sadashivaiah, Daniel Steil, Mirko Cinchetti, Stefan Mathias, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

Using femtosecond time-resolved MOKE to study ultrafast demagnetization is today a standard experimental approach. However, there is still an ongoing debate on the so called optical artifacts in the signal, and when and how true magnetization dynamics are extracted. In our measurements of ultrafast demagnetization of Ni/Au we have the peculiar situation that the MOKE rotation & ellipticity signals differ by demagnetization constants of a factor of two. In order to distinguish demagnetization from non-magnetic effects, we study this system with different fs-techniques and for varying material compositions.