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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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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 Kuch11Freie 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).

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