Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Monday: 2D Materials 1
O 18.22: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Comparison of spin-crossover properties between thin film and bulk sample of a binuclear Fe(II) complex — •Marcel Walter1, Sangeeta Thakur1, Clara Trommer2, Felix Tuczek2, Sebastien Elie Hadjadj1, Jorge Torres1, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel
Spin-crossover molecules (SCMs) are a promising material in the field of spintronics, due to the reversibility of switching between a high-spin and a low-spin state, which can be triggered by light and temperature [1]. The focus of our research is to deposit large SCMs to explore cooperativity in spin switching on surfaces. A pulsed-valve vapor deposition method is used for thin films. This has the advantage of depositing (sub-) monolayers of SCMs in an UHV environment without applying large amounts of thermal energy, which can decompose the large SCMs. We compare the spin-switching behavior of the dinuclear SCM [{Fe(H2B(pz)2)2}2(µ-bipy-ac-bipy)] as thin film on highly oriented pyrolytic graphite and as bulk sample using X-ray absorption spectroscopy. The spin-crossover properties were examined for thermal-induced spin state switching as well as for light-induced excited spin-state trapping. The results show that the thin films are locked in a mixed spin state while the bulk sample switches completely, although the equilibrium temperature of the spin states is comparable.
[1] L. Kipgen et al., Advanced Materials 33, 24 (2021)