Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetic textures II
MA 51.8: Vortrag
Donnerstag, 15. März 2018, 17:00–17:15, EB 407
Antiferromagnetic dynamics in time and space — •Nele Thielemann-Kühn1,2,3, Daniel Schick1, Niko Pontius1, Alessandro Romualdi1,3, Rolf Mitzner1, Karsten Holldack1, Alexander Föhlisch1,2, and Christian Schüßler-Langeheine1 — 1Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 2Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Straße 24/25, 14476 Potsdam, Germany — 3Fachbreich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
With combined time [1]- and depth-resolved [2] x-ray magnetic resonant diffraction we studied optically induced antiferromagnetic dynamics in the 4f metal dysprosium. This allows us to draw not only conclusion about the temporal development but also on the spatial evolution of the magnetic order after exposure to a pump-laser pulse. We find a complex depth dependent quenching behavior of the magnetic order indicative for the interplay of different delocalized as well as local excitation channels. Further, on longer time scales, we observe two clearly distinguishable regions with different magnetic properties within the sample hinting to a long-living non-equilibrium state of the 4f magnetic system.
[1] H. Ott et al., Phys. Rev. B 82, 214408 (2010).
[2] N. Thielemann-Kühn et al., Phys. Rev. Lett. 119, 197202 (2017).