Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 17: Adsorption on Metal Surfaces
O 17.7: Talk
Monday, March 7, 2016, 16:30–16:45, H6
Reversible light-induced spin-state switching in Fe(II) spin-crossover films on Au(111) studied with NEXAFS and PES — •Sebastian Rohlf1, Matthias Kalläne1, Arndt Quer1, Holger Naggert2, Felix Tuczek2, and Kai Rossnagel1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24098 Kiel, Germany — 2Institut für Anorganische Chemie, Universität Kiel, 24098 Kiel, Germany
Fe(II) coordination complexes are model systems for organic molecules whose electronic, magnetic, and structural properties can be manipulated by external stimuli. Moreover, the temperature- and irradiation-dependent spin transitions observed in a number of these materials may provide a suitable testbed for the development of future spintronic devices. Light-induced spin-state trapping (LIESST) in thin molecular films of these complexes is well established. Here, we present a combined near edge X-ray absorption fine structure (NEXAFS) and photoelectron spectroscopy (PES) study of the LIESST and, for the first time, of the reverse LIESST of thin films of the spin-crossover complex Fe(H2bpz)2(phen) adsorbed on Au(111). The NEXAFS spectra reveal two different stable molecular spin states after green and infrared light irradiation at low temperatures. The PES results confirm these observations and, furthermore, provide information on the efficiencies of the light-induced transition processes.