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MA: Fachverband Magnetismus

MA 3: Ultrafast Magnetization Effects I

MA 3.9: Talk

Monday, March 18, 2024, 12:00–12:15, H 2013

Femtosecond spin-state switching in Fe(II) spin-crossover thin films — •Lea Kämmerer1, G. Kämmerer1, M. Gruber1, J. Grunwald2, T. Lojewski1, L. Mercadier3, L. Le Guyader3, R. Carley3, C. Carinan3, N. Gerasimova3, D. Hickin3, B. E. Van Kuiken3, G. Mercurio3, M. Teichmann3, S. K. Kuppusamy4, A. Scherz3, M. Ruben4, 5, K. Sokolowski-Tinten1, A. Eschenlohr1, K. Ollefs1, C. Schmitz-Antoniak6, F. Tuczek2, P. Kratzer1, U. Bovensiepen1, and H. Wende11University of Duisburg-Essen and CENIDE — 2Christian-Albrechts-University Kiel — 3European XFEL — 4Karlsruhe Institute for Technology — 5Institut de Science et d*Ingénierie Supramoléculaires (ISIS) Strasbourg Cedex — 6Technical University of Applied Science Wildau

Spin-crossover molecules have gained popularity in recent years due to their potential applications, including molecular switches. Understanding their switching dynamics is crucial for optimizing their properties, which involve an abrupt, broad thermal hysteresis as a result of cooperative switching at room temperature. X-ray absorption spectroscopy is a sensitive tool for studying the spin-state. Combining X-ray absorption spectroscopy with a femtosecond time-resolution at the European XFEL allowed observation of the underlying femtosecond switching dynamics in Fe(II) spin-crossover thin films. Optical laser pumping triggered the sub-picosecond light-induced low-spin to high-spin transition in this experiment. A detailed analysis of the dynamics reveals the transient population of an intermediate state.

Keywords: time-resolved XAS; ultrafast spectroscopy; spin-crossover molecules

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