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MA: Fachverband Magnetismus
MA 16: Bio- and Molecular magnetism
MA 16.9: Talk
Tuesday, March 17, 2015, 11:45–12:00, EB 202
Light-Induced Switching of the Spin of Fe Complexes on Surfaces — •Matthias Bernien1, Holger Naggert2, Christian F. Hermanns1, Fabian Nickel1, Lucas M. Arruda1, Lalminthang Kipgen1, Jorge Miguel1, Alex Krüger1, Dennis Krüger1, Enrico Schierle3, Eugen Weschke3, Felix Tuczek2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin — 2Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel — 3Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin
Sublimable spin-crossover complexes have recently gained a lot of attention due to their potential application as building blocks for molecular spintronic devices. These molecules possess a metastable spin state that reacts sensitively to tiny perturbations in temperature, light exposure, or intermolecular interactions. If these complexes are immobilized on a solid surface, the spin transition is often quenched. We have studied submonolayers of the Fe(II) spin-crossover complex [Fe(bpz)2(phen)] (bpz=dihydrobis(pyrazolyl)borate, phen=1,10-phenanthroline) by means of x-ray absorption spectroscopy. Using highly oriented pyrolytic graphite (HOPG) as a weakly interacting substrate we show that even molecules that are in direct contact with a solid surface can undergo a spin-crossover transition as a function of temperature. X-ray magnetic circular dichroism shows that the spin of [Fe(bpz)2(phen)] can be switched from S=0 to S=2 highly efficiently using green light of 520 nm wavelength at T=5 K. — Financial support by the DFG (Sfb’s 658 and 677) is gratefully acknowledged.