Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.27: Poster
Thursday, March 19, 2020, 15:00–18:00, P3
Temperature- and light-induced spin-state switching at sub-monolayer coverage in a sublimated spin-crossover film on graphite — •Sangeeta Thakur1, Evangelos Golias1, Ivar Kumberg1, Kuppusamy S. Kumar2, Rahil Hosseinifar1, Jorge Torres1, Lalminthang Kipgen1, Lucas M. Arruda1, Chen Luo3, Florin Radu3, Mario Ruben2, and Wolfgang Kuch1 — 1Freie Universität Berlin, Institut für Experimentalphysik, Berlin, Germany — 2Institut de Physique et Chimie des Materiaux (IPCMS), Université de Strasbourg, France — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin Germany
Molecular self-assembly of the complex [Fe(H2B(pz)2)2-bipy] with COOC12H25 was used to fabricate thin spin-switchable surface-bound films, with programmable intermolecular interactions [1]. Thermal- and light-induced spin-crossover behavior of 0.4 ML of [Fe(H2B(pz)2)2COOC12H25-bipy] was studied on a highly oriented pyrolytic graphite (HOPG) surface by x-ray absorption spectroscopy. The highest fraction of low-spin (LS) state is found around 40 K (42 %), while at 10 K soft-x-ray-induced excited spin-state trapping decreases the fraction of LS-state molecules to 36 %. Illumination with green light at 10 K leads to a complete spin conversion to the high-spin (HS) state. Although molecules undergo a complete spin-state conversion (HS ↔ LS) both in bulk and in a thick film on SiOx [1], this effect is not observed in the submonolayer deposit on HOPG, highlighting the role of molecule–substrate interactions.
[1] K. S. Kumar et al., Adv. Mater. 30, 1705416 (2018).