Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Organic-Inorganic Hybrid Systems and Organic Films IV

O 29.8: Vortrag

Dienstag, 21. März 2017, 12:15–12:30, WIL A317

NEXAFS study of robust ultrathin Fe(II) spin-crossover films on surfaces — •Sebastian Rohlf1, Matthias Kalläne1, Simon Jarausch1, Benedikt Flöser2, Felix Tuczek2, and Kai Rossnagel11Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24098 Kiel, Germany — 2Institut für Anorganische Chemie, Universität Kiel, 24098 Kiel, Germany

The spin-state manipulation of Fe(II) coordination complexes by external stimuli is associated with a change in the electronic, magnetic, and structural properties. In particular, the temperature- and light-induced switching mechanisms may be utilized in future spintronic devices. Both of these switching effects were observed even in monolayers adsorbed on the weakly interacting substrate HOPG [1]. Nevertheless, the dissociation of spin-crossover (SCO) molecules in direct contact to a metal surface is still impeding measurements in device-like environments. A novel approach to overcome this limitation is the electronically stabilized SCO system Fe(pyrpy)2(phen), a recently synthesized derivative of the well-studied complex Fe(H2bpz)2(phen). Here, we present near edge X-ray absorption fine structure (NEXAFS) spectroscopy results of Fe(pyrpy)2(phen), adsorbed in thin films on Au(111) and TiTe2, for different temperatures and laser light irradiation conditions. Our results confirm the preservation of the spin-switching ability in thin films of this derivative. Furthermore, the comparison of the measured switching efficiencies on both substrates provides evidence for an intact interface layer in contact to the Au(111) surface. [1] M. Bernien et al., ACS Nano 9, 8960-8966 (2015).

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