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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Bio- and Molecular magnetism

MA 16.9: Vortrag

Dienstag, 17. März 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 Kuch11Institut 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.

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