Regensburg 2013 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 22: Poster II
DF 22.51: Poster
Friday, March 15, 2013, 10:30–13:30, Poster D
Femtosecond spin dynamics in ferromagnet/metal bi-layers — •Daniel Simon1,2, Roman Adam1,2, Moritz Plötzing1,2, Christian Weier1,2, Dennis Rudolf1,2, and Claus M. Schneider1,2 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Gemany — 2JARA - Fundamentals of Future Information Technologies
Laser-induced demagnetization of ferromagnetic films is known to be an effect on the timescale of a few hundred femtoseconds. Among many proposed mechanisms, spin-flip processes [1] and spin-superdiffusion [2, 3] have been proposed to explain these ultrafast developments. In the presented work, we investigate spin dynamics of ferromagnet (4nm)/metal (20nm) bi-layers in a backside-pump/frontside-probe setup using infrared (800nm) pump and blue (400nm) probe laser pulses. This geometry allows us to probe the magnetization dynamics spatially separated from the pumping. Our measurements show an influence of the pump pulse on the magnetization even though a direct pumping is suppressed by the metal layer, giving rise to an interpretation based on a non-local effect, namely spin currents.
[1] B. Koopmans, et al. Nature Materials 9, 259 (2010).
[2] D. Rudolf, et al. Nature Communications 3, 1037 (2012).
[3] M. Battiato, et al. Phys. Rev. Lett. 105, 027203 (2010).