Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.24: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Ligand-induced spin-state locking of a spin-crossover molecule on a graphite surface — Lalminthang Kipgen1, Matthias Bernien1, Andrew J. Britton1, Holger Naggert2, Sascha Ossinger2, Fabian Nickel1, Lucas M. Arruda1, Evangelos Golias1, •Ivar Kumberg1, Chen Luo3, Hanyo Ryll4, Florin Radu4, Felix Tuczek2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany — 3Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany — 4Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany
Spin-crossover molecules (SCMs) have potential applications in optical memory and display elements as they can exist in two different magnetic states – high-spin (HS, S = 2) and low-spin (LS, S = 0) – which can be reversibly switched by temperature or light. The property of SCMs can be largely altered by suitably modifying the ligands; this is interesting especially for SCMs deposited on a surface — a prerequisite for device fabrication. Herein, four methyl groups are added to the SCM [Fe(H2B(pz)2bipy] (pz = pyrazole; bipy = bipyridine) at the bipy ligand. While the original molecule is reported to undergo both optical- and thermal-induced spin switching on a graphite surface, the modified molecule is locked in the HS state on the same surface; only molecules lying at the second-monolayer onward retain their spin-crossover.