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MA: Fachverband Magnetismus

MA 5: Magnetization/Demagnetization Dynamics

MA 5.9: Vortrag

Montag, 20. März 2017, 11:45–12:00, HSZ 401

Quenching of the Resonant Magnetic Scattering Cross Section by Ultra-Short Free-Electron Laser Light Pulses — •L. Müller¹, M.H. Berntsen², W. Roseker¹, A. Philippi-Kobs¹, K. Bagschik³, J. Wagner³, R. Frömter³, F. Capotondi⁴, E. Pedersoli⁴, M.B. Danailov⁴, M. Kiskinova⁴, H.P. Oepen³, and G. Grübel¹ — ¹Deutsches Elektronen-Synchrotron DESY, FS-CXS, Hamburg, Germany — ²KTH Royal Institute of Technology, Stockholm, Sweden — ³Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Hamburg, Germany — ⁴Elettra Sincrotrone Trieste, Basovizza, Italy

The new free-electron laser (FEL) sources provide radiation with unprecedented parameters in terms of ultrashort pulse length, high photon flux, and coherence. These properties make FELs ideal tools for studying ultrafast dynamics in matter on a previously inaccessible level. Yet, FELs do not only probe matter, but can also drive it into highly excited states which are otherwise inaccessible. For example, a state can be reached in which resonant magnetic scattering is highly suppressed [1].

Here, we report on a resonant magnetic scattering experiment, where the focussed FEL light pulses probe the magnetic domain system of a Co/Pt multilayer thin film with perpendicular magnetic anisotropy. Both, single and double FEL pulses at different fluences are used to follow the quenching of the resonant scattering efficiency.
[1] L. Müller et al., Phys. Rev. Lett. 110, 234801 (2013).