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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).