Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Ultrafast Magnetization Effects II
MA 9.8: Vortrag
Montag, 18. März 2024, 17:15–17:30, H 2013
Time-resolved resonant magnetic small-angle scattering with a laser-driven soft-X-ray plasma source — •Leonid Lunin1, Niklas Schneider1, Konstanze Korell1, Martin Borchert1, Michael Schneider1, Johannes Tümmler1, Stefan Eisebitt1, 2, Bastian Pfau1, and Daniel Schick1 — 1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany — 2Institut für Optik & Atomare Physik, TU Berlin, Germany
Resonant soft-X-ray scattering methods provide unique possibilities to study nanometer-scale magnetization dynamics with element selectivity and on ultrafast timescales when employing ultrashort pulsed X-ray sources. Based on a laser-driven plasma X-ray source, we have developed a novel instrument to carry out time-resolved magnetic small-angle X-ray scattering (SAXS) experiments in the soft-X-ray range between 500 and 1500 eV with sub-10 ps temporal resolution. In this contribution, we show time and element-resolved magnetic SAXS results of a photoexcited GdFe multilayer sample. The 2D scattering patterns collected contain information on the local magnetization, periodicity, and distribution of the magnetic maze domains in GdFe. The development of an online processing software for a hybrid-pixel detector enables us to drastically enhance the signal-to-noise ratio of the time-resolved data and reduce overall dead-times of the setup. Due to the flexibility of our laboratory-scale setup, we can further vary the sample environment, e.g., by applying external magnetic fields as well as cryogenic temperatures, and observe significant differences in the ground-state-dependent dynamics of the magnetic domains.
Keywords: soft-X-ray scattering; small-angle scattering; ultrafast dynamics; hybrid x-ray detector; magnetic domains