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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.26: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
Fluence-dependent ultrafast magnetization dynamics in Gd and Tb thin films and TbGd bilayers studied by XMCD in reflection — •Markus Gleich1, Kamil Bobowski1, Dominic Lawrenz1, Can Çağincan1, Niko Pontius2, Daniel Schick2, Christoph Trabant1, Marko Wietstruk1, Björn Frietsch1, Christian Schüßler-Langeheine2, 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 fluence-dependent ultrafast magnetization dynamics of lanthanide thin films. Single-crystalline films were grown on a W(110) substrate providing sufficient cooling to observe de- and remagnetization in pump-probe spectroscopy. The transient magnetization was probed element-specifically by X-ray magnetic circular dichroism in reflection at the FEMTOSPEX facility of BESSY II. All samples show a two-step demagnetization as observed in previous experiments on Gd and Tb [1-4]. On the ultrafast time scale (< 2 ps) Tb is demagnetized most effectively followed by Gd and, surprisingly, Gd in a 3 ML Tb on Gd bilayer. On the long time scale Tb shows a much faster magnetization recovery than Gd. We attribute the difference in dynamics to the stronger spin-lattice coupling in Tb.
[1] M. Wietstruk et al., Phys. Rev. Lett. 106, 127401 (2011).
[2] M. Sultan et al., Phys. Rev. B 85, 184407 (2012).
[3] A. Eschenlohr et al., Phys. Rev. B 89, 214423 (2014).
[4] K. Bobowski et al., J. Phys.: Condens. Matter 29, 234003 (2017).