Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.67: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

Influence of the pump pulse photon energy on the ultrafast magnetization dynamics of gadolinium — •Markus Gleich¹, Kamil Bobowski¹, Niko Pontius², Christian Schüßler-Langeheine², Christoph Trabant¹, Marko Wietstruk¹, Björn Frietsch¹, and Martin Weinelt¹ — ¹Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — ²Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin

We have investigated the dependence of the pump pulse photon energy on the ultrafast magnetization dynamics of gadolinium. Single-crystalline Gd(0001) thin films were grown on a W(110) substrate. This allows us to study the magnetization dynamics by X-ray magnetic circular dichroism in reflection at the FEMTOSPEX facility of BESSY II. To clarify the role of electron transport, we performed simulations of the magnetization dynamics based on the microscopic three temperature model (M3TM) [1]. The M3TM was modified and extended to include the laser excitation process [2]. To reproduce the measured dynamics, we have varied several parameters such as the thermal conductivity and the heat capacity.

[1] B. Koopmans et al., Nat. Mater. 9, 259–265 (2010).

[2] Y. P. Meshcheryakov et al., Appl. Phys. A 82, 363–368 (2005).