SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.37: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Thermal- and Light-Induced Spin-Crossover Characteristics of a Functional Iron(II) Complex at Submonolayer Coverage on HOPG — •Sangeeta Thakur1, Evangelos Golias1, Ivar Kumberg1, Kuppusamy S. Kumar2, Rahil Hosseinifar1, Jorge Torres1, Lalminthang Kipgen1, Christian Lotze1, Lucas M. Arruda1, Florin Radu3, Mario Ruben2, and Wolfgang Kuch1 — 1Freie Universität Berlin, Institut für Experimentalphysik, Berlin, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
The role of molecule-substrate interactions on the thermal- and light-induced spin-state switching characteristics of 0.4 monolayer of a functional spin-crossover(SCO)-complex [Fe(H2B(pz)2)2COOC12H25-bipy] on a highly oriented pyrolytic graphite (HOPG) substrate was studied using x-ray absorption spectroscopy [1]. A spin-state coexistence of 42% low-spin (LS) and 58% high-spin (HS) is observed for the complex at 40 K, in contrast to the complete spin-state switching observed in the bulk and in SiOx-bound 10 nm thick films [2], highlighting the role of molecule-substrate interactions. The 100% HS state obtained after light irradiation at 10 K indicates the occurrence of efficient on-surface light-induced spin switching, encouraging the development of light-addressable molecular devices based on SCO complexes.
[1] S. Thakur et al. J. Phys. Chem. C 125, 25, (2021).
[2] K. S. Kumar et al., Adv. Mater. 30, 1705416, (2018).