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MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects III
MA 38.6: Vortrag
Donnerstag, 21. März 2024, 12:30–12:45, EB 202
Ultrafast Magnetization Dynamics of Nanoscale Domains in Ferrimagnetic DyCo Films Studied at European XFEL — •Simon Marotzke1,2, André Philippi-Kobs1, Dieter Lott3, Matthias Riepp4, Leonard Müller1, Robert Frömter5, Loic Le Guyader6, Andreas Scherz6, Florin Radu7, Gerhard Grübel1,6, Martin Beye1,8, and Kai Rossnagel1,2 — 1DESY, Hamburg, Germany — 2CAU Kiel, Germany — 3Helmholtz-Zentrum Hereon, Geesthacht, Germany — 4Université de Strasbourg, France — 5JGU Mainz, Germany — 6European XFEL, Schenefeld, Germany — 7HZB, Berlin, Germany — 8Stockholm University, Sweden
Ferrimagnetic DyCox is a fascinating magnetic composition for both fundamental as well as applied studies on magnetism due to the easy tunability of its magnetic state by temperature and composition. While the global behavior of its magnetization dynamics upon ultrashort laser excitation has been studied, the response of its nanoscale magnetic domain state is completely unknown. Here, in particular, it is of high interest if super-diffusive currents of highly excited electrons lead to modifications of the domain structure that may be different for both Dy and Co sublattices, resulting in the creation of a transient non-collinear state within the domain walls. We addressed the ultrafast response of the nanoscale domain state by performing magnetic small-angle X-ray scattering experiments on ultrathin DyCo3 films at the Spectroscopy and Coherent Scattering (SCS) instrument of the European XFEL. We report on first results indicating the existence of a transient non-colinear magnetic state.
Keywords: Magnetization dynamics; Free-electron laser; Magnetic scattering; Ferrimagnets; Soft X-rays