Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.26: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Delay- and depth-dependent simulations of the fluence-dependent magnetization dynamics in Gd — •Markus Gleich¹, Kamil Bobowski¹, Björn Frietsch¹, Niko Pontius², Christian Schüßler-Langeheine², Christoph Trabant¹, Marko Wietstruk¹, and Martin Weinelt¹ — ¹Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany

We performed delay- and depth-dependent simulations of the fluence-dependent magnetization dynamics in Gd based on the microscopic three temperature model (M3TM) by Koopmans et al. [1]. For the calculations the M3TM was modified and extended to model the laser excitation process [2]. Our results were compared with the fluence-dependent magnetization dynamics (1.9 – 11.2 mJ/cm²) of a single-crystalline Gd(0001) sample measured with X-ray magnetic circular dichroism in reflection at the FEMTOSPEX facility at BESSY II. For the simulations several parameters, e.g., the thermal conductivity and the heat capacity, were varied to reproduce the measured fluence-dependent magnetization dynamics. Our simulations reproduce the two-step demagnetization qualitatively but we could not achieve the quantitative agreement previously demonstrated for nickel [3].

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

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

[3] T. Roth et al., Phys. Rev. X 2, 021006 (2012).