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MA: Fachverband Magnetismus

MA 2: Ultrafast Magnetization I

MA 2.11: Vortrag

Montag, 16. März 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 Zabel^1,5, Yuriy Mokrousov^1,3, 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.