Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 42: Molecular Magnetism and Magnetic Particles / Clusters II
MA 42.3: Vortrag
Donnerstag, 12. März 2026, 10:00–10:15, HSZ/0004
Femtosecond spin-state switching dynamics of Fe(II) complexes condensed in thin films — •Manuel Gruber1, Lea Kämmerer1, Gérald Kämmerer1, Laurent Mercadier2, Andreas Scherz2, Felix Tuczek3, Peter Kratzer1, Uwe Bovensiepen1, and Heiko Wende1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2European XFEL, Schenefeld, Germany — 3Institute for Inorganic Chemistry, Kiel University, Germany
Significant progress has been made in tailoring spin-crossover films, driven by their potential for technological applications. However, studies of ultrafast switching in such films remain limited compared to their solution-phase counterparts. Here, we investigated photoinduced spin-state switching in a molecular film at room temperature, using the new capabilities offered by X-ray free-electron lasers. The sub-picosecond transition from the S=0 low-spin state to the S=2 high-spin state is tracked via transient changes in the Fe L3 X-ray absorption edge. Our results reveal the involvement of an intermediate state in the switching dynamics [Kämmerer et al., ACS Nano 18, 34596 (2024)].
Financial support from CRC 1242 is gratefully acknowledged.
Keywords: spin crossover; x-ray absorption spectroscopy; ultrafast