Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Ultrafast Magnetization Effects 1
MA 8.2: Vortrag
Montag, 5. September 2022, 15:15–15:30, H37
Ultrafast element- and depth-resolved magnetization dynamics probed by transverse magneto-optical Kerr effect spectroscopy in the soft x-ray range — •Martin Hennecke1, Daniel Schick1, Themistoklis Sidiropoulos1, Felix Willems1, Anke Heilmann1, Martin Bock1, Lutz Ehrentraut1, Dieter Engel1, Piet Hessing1, Bastian Pfau1, Martin Schmidbauer2, Andreas Furchner3,4, Matthias Schnuerer1, Clemens von Korff Schmising1, and Stefan Eisebitt1,5 — 1Max-Born-Institut, Berlin, Germany — 2Leibniz-Institut für Kristallzüchtung, Berlin, Germany — 3Helmholtz-Zentrum Berlin, Berlin, Germany — 4Leibniz-Institut für Analytische Wissenschaften, Berlin, Germany — 5IOAP, Technische Universität Berlin, Berlin, Germany
Understanding the light-driven spin dynamics occurring at buried interfaces of complex magnetic heterostructures as used in today’s opto-spintronics applications requires direct experimental access to the nonlocal magnetic order on sub-ps time scales. Here, we report on broadband time- and angle-resolved transverse magneto-optical Kerr effect spectroscopy probing the Gd N5,4 resonance (≈150 eV) of a ferrimagnetic GdFe nanostructure with fs soft x-ray pulses provided by a laboratory-scale light source based on high-harmonic generation. Employing a pump-probe technique, we follow the fs laser-induced demagnetization of the GdFe layer. Analyzing the fs time-resolved spectra via magnetic scattering simulations allows a quantitative determination of the transient magnetization depth profiles evolving within the magnetic film due to strongly layer-dependent photoexcitation.