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MA: Fachverband Magnetismus

MA 43: Magnetization Dynamics II of 3

MA 43.3: Talk

Thursday, March 14, 2013, 15:30–15:45, H22

Spin-flip scattering versus superdiffusive transport in the femtosecond-demagnetization of Nickel — •Oliver Schmitt, Daniel Steil, Sabine Alebrand, Stefan Mathias, Mirko Cinchetti, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany

The phenomenon of ultrafast demagnetization is currently explained by at least two different theories: Spin-flip dynamics via the Elliott-Yafet (EY)-mechanism [1,2], and superdiffusive spin transport [3]. To disentangle the influence of these two spin relaxation mechanisms on the ultrafast demagnetization process, we have performed studies using the time-resolved magneto-optical Kerr effect (TRMOKE) on Ni samples for different film thicknesses and substrate materials. The obtained results demonstrate a strong thickness dependence of the maximum magnetization quenching as well as a dependence of the demagnetization constant on the substrate material. The applicability of EY and superdiffusive transport is discussed on the basis of the obtained results.

[1] B. Koopmans, G. Malinowski, F. Dalla Longa, D. Steiauf, M. Fähnle, T. Roth, M. Cinchetti and M. Aeschlimann, NMat 9(3): 259-265 (2010)

[2] T. Roth, A. J. Schellekens, S. Alebrand, O. Schmitt, D. Steil, B. Koopmans, M. Cinchetti, and M. Aeschlimann, PRX 2, 021006 (2012)

[3] M. Battiato, K. Carva, and P. M. Oppeneer, PRB 86, 024404 (2012)