Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 2: Ultrafast Magnetization I
MA 2.11: Talk
Monday, March 16, 2020, 12:15–12:30, HSZ 101
Ultrafast demagnetisation and recovery of chiral magnetic domain walls probed by dichroic X-ray magnetic scattering — •Nico Kerber1, Dmitriy Ksenzov2, Frank Freimuth3, Flavio Capotondi4, Boris Seng1, Joel Cramer1, Hartmut Zabel1,5, Yuriy Mokrousov1,3, Mathias Kläui1, and Christian Gutt2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany — 2Department Physik, Universität Siegen, Walter-Flex-Strasse 3, 57072, Siegen, Germany — 3Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 4FERMI, Elettra-Sincrotrone Trieste, 34149, Basovizza, Trieste, Italy. — 5Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany
We employ pulses from a XUV free-electron laser and investigate time-resolved the evolution of the chirality of domain walls in magnetic thin film samples by an IR pump - X-ray magnetic scattering (XRMS) probe experiment. Using samples with interfacial DMI and perpendicular magnetic anisotropy exhibiting labyrinth-like domain patterns we measure in the same experiment both the dichroic signal related to the chirality of the domain walls and the sum signal related to the average domain magnetisation. We observe an ultrafast decrease of both signals in the subpicosecond regime with similar time constants. However, we find a significantly faster recovery of the chiral signal on the sub-ns timescale.