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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.27: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P3
Ultrafast magnetization dynamics in TbGd bilayers and the effect of interlayer angular momentum transport — •Markus Gleich1, Kamil Bobowski1, Dominic Lawrenz1, Can Çağincan1, Niko Pontius2, Daniel Schick2, Torsten Kachel2, 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 ultrafast magnetization dynamics in TbGd bilayers by XMCD in reflection at the FemtoSpeX facility of BESSY II. The bilayers were epitaxially grown on W(110) and show a two-step demagnetization as observed for Gd and Tb [1-3]. Already few layers of Tb influence the temperature-dependent magnetization of the Gd layer. This interaction depends on the distance to the interface suggesting substantial Gd-Tb spin-coupling. We obtained good agreement between experimental results on ultrafast magnetization dynamics and simulations based on the M3TM [4], which has been extended to account for temperature-dependent thermal conductivity and heat capacity, and most importantly interlayer spin transport.
[1] M. Wietstruk et al., Phys. Rev. Lett. 106, 127401 (2011).
[2] A. Eschenlohr et al., Phys. Rev. B 89, 214423 (2014).
[3] K. Bobowski et al., J. Phys.: Condens. Matter 29, 234003 (2017).
[4] B. Koopmans et al., Nat. Mater. 9, 259–265 (2010).