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MA: Fachverband Magnetismus

MA 49: POSTER II

MA 49.3: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster A

XAS Study of the Spin-Crossover Molecules Fe(bpz)2phen and Fe(bpz)2bipy on Surfaces — •Lalminthang Kipgen1, Holger Naggert2, Matthias Bernien1, Fabian Nickel1, Jens Kopprasch1, Qingyu Xu1,3, Felix Tuczek2, and Wolfgang Kuch11Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin, Germany — 2Institut für Anorganische Chemie, Christian-Albrechts Universität zu Kiel, 24098 Kiel, Germany — 3Department of Physics, Southeast University, 211189 Nanjing, P.R. China

The Spin-crossover molecules Fe(bpz)2phen and Fe(bpz)2bipy (bpz=dihydrobis(pyrazolyl)borate, phen = 1,10-phenanthroline, bipy = 2,2-bipyridine) have recently attracted a lot of attention due to their suitability for vacuum deposition. Thin films and even single molecules on surfaces have been studied. However, if the molecules are in direct contact with another material, their spin-crossover properties may be altered or even suppressed. We have investigated submonolayers of Fe(bpz)2phen and Fe(bpz)2bipy on Au(111), Bi(111) and HOPG surfaces by means of X-ray absorption spectroscopy (XAS). We find that submonolayers of Fe(bpz)2bipy on Au(111) do not exhibit thermal spin-crossover behavior. On HOPG, in contrast, these molecules show complete spin-state switching as a function of temperature. Submonolayers of Fe(bpz)2phen on Bi(111) show a partial conversion of about 40 percent as a function of temperature and illumination with green light at T = 5 K. Financial support by the DFG (Sfb’s 658 and 677) is gratefully acknowledged.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin