Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.23: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Fluence-dependent ultrafast magnetization dynamics in TbGd bilayers and their interfacial spin-coupling — •Markus Gleich1, Kamil Bobowski1, Dominic Lawrenz1, Can Çağincan1, Niko Pontius2, Daniel Schick2, Christian Schüßler-Langeheine2, Björn Frietsch1, Unai Atxitia1, Nele Thielemann-Kühn1, 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 studied the fluence-dependent ultrafast magnetization dynamics in TbGd bilayers by XMCD in reflection at the FemtoSpex facility of BESSY II. The bilayers were grown on a W(110) substrate and show a two-step demagnetization as observed in previous experiments on Gd and Tb [1-4]. Interestingly, the static magnetic properties and the spin dynamics of a Gd thin film can be significantly altered by depositing only a few monolayers of Tb on top. The temperature-dependent magnetization of Gd in TbGd bilayers is influenced by the Tb layer depending on the distance from the interface, which suggests a substantial spin-coupling between Gd and 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).