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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.22: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
Time resolved MOKE measurements with calibrated lattice temperatures — •Lisa Willig1,3, Jan-Etienne Pudell1, Marc Herzog1, Matthias Kronseder2, Christian Back2, Alexander von Reppert1, and Matias Bargheer1,3 — 1Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — 3Helmholtz-Zentrum Berlin, Berlin, Germany
We measure the response of the spin system in thin Ni films after excitation with a 800nm pump pulse via the time-resolved magneto-optical Kerr effect (MOKE) for various pump fluences. We calibrate the absorbed energy by ultrafast x-ray diffraction (UXRD), which is sensitive to the transient temperature of the Nickel lattice. We are particularly interested in high fluence measurements, where the lattice temperature rises above the Curie temperature. The tr-MOKE signal confirms that the spin system is fully disordered for long times up to 100 ps. We analyze the recovery of the magnetization.