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MA: Fachverband Magnetismus
MA 11: Ultrafast magnetism II
MA 11.3: Talk
Monday, March 12, 2018, 15:30–15:45, EB 407
Ultrafast demagnetization in Co/Pt multilayers probed by mSAXS at the Co L-edge — •Matthias Riepp1, Leonard Müller1, André Philippi-Kobs1, Wojciech Roseker1, Robert Frömter2, Emanuele Pedersoli3, Flavio Capotondi3, Maya Kiskinova3, Hans Peter Oepen2, and Gerhard Grübel1 — 1Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany — 2Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 3Elettra-Sincrotrone Trieste S.C.p.A. di interesse nazionale, Strada Statale 14 - km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy
Ultrafast demagnetization of thin magnetic films due to an optical pump is a phenomenon which is still discussed highly controversial. Here, to probe the response of magnetization on a nanometer length as well as on a femtosecond time scale, a resonant magnetic small-angle X-ray scattering (mSAXS) experiment was employed at the DiProI beamline at FERMI. Co/Pt multilayers with perpendicular magnetic anisotropy and a maze-domain pattern were investigated. Changes of the magnetic state due to IR-laser irradiation were detected as a function of pump probe delay time. In this experiment we have used soft X-rays tuned to the Co L3-edge (1.59 nm) by using FERMI’s FEL-2. FERMI was tuned to provide linear polarized light at a wavelength of 4.78 nm in the fundamental so that the third harmonic of this radiation was in resonance with the Co L-edge. By comparing the results with the ones obtained using the Co M-edge (20.8 nm), the role of super-diffusive spin currents on the demagnetization is discussed.