Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Magnetization Dynamics IV
MA 38.9: Vortrag
Mittwoch, 16. März 2011, 16:45–17:00, HSZ 403
Ultrafast Demagnetization Dynamics in Ni1−xPdx alloys — •Moritz Plötzing1, Patrik Grychtol1, Dennis Lvovsky1, Roman Adam1, Claus M. Schneider1, Hans Nembach2, Justin Shaw2, Tom Silva2, Daniel Steil3, Mirko Cinchetti3, and Martin Aeschlimann3 — 1Institute of Solid State Research, IFF-9, Research Center Jülich, 52425, Jülich, Germany — 2Electromagnetics Division, National Institute of Standards and Technology, Boulder, Colorado 80305-3328, USA — 3University of Kaiserslautern and Research Center OPTIMAS, 67663, Kaiserslautern, Germany
In our study we systematically investigate the ultrafast demagnetization process of alloys based on Ni and Pd induced by intense laser pulses in the femtosecond range. To this end, we fabricated samples by thermal co-evaporation of the respective elements over a wide range of Ni1−xPdx stoichiometries. We characterized all samples by measurements of the ferromagnetic resonance to determine the Gilbert damping parameter α as well as by measurements of the critical temperature Tc in a vibrating sample magnetometer. In time-resolved pump-probe experiments, exploiting the magneto-optical Kerr effect, we measured the demagnetization time τM for different Ni1−xPdx samples. Our contribution presents detailed experimental analysis of the relation of τM to α and Tc compared to the theoretical predictions as presented in [1].
[1] Koopmans et al., Phys. Rev. Lett. 95, 267207 (2005)