Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 27: Bio- and Molecular Magnetism

MA 27.13: Vortrag

Donnerstag, 28. Februar 2008, 17:30–17:45, EB 202

Electronic and Magnetic Properties of Mn₁₂ Single-Molecule Magnets on the Au(111) Surface — •Sönke Voss¹, Michael Burgert¹, Mikhail Fonin¹, Christian Michaelis², Ivan Brihuega², Yury S. Dedkov³, Ulrich Groth¹, Klaus Kern², and Ulrich Rüdiger¹ — ¹Universität Konstanz, 78457 Konstanz — ²Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart — ³Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden

The paramount interest in single-molecule magnets (SMMs) like Mn₁₂-acetate and its derivatives was inspired by numerous experimental and theoretical insights indicating the feasibility of addressing quantum effects of magnetism on a molecular scale. Due to its relatively high blocking temperature (∼3K) combined with the ability to identify well-defined spin states, Mn₁₂ still remains the most favoured SMM possibly allowing the detection of magnetic fingerprints in transport properties of a single molecule.

In this work, the electronic properties of Mn₁₂ molecules chemically grafted on Au(111) surfaces have been studied by means of low temperature as well as room temperature scanning tunneling microscopy and spectroscopy (STS), x-ray absorption spectroscopy and photoelectron spectroscopy. The results revealed signatures from most probably intact Mn₁₂ molecules while STS measurements in magnetic fields indicate the possibility to identify magnetic fingerprints in scanning tunneling spectra. The results will be discussed with respect to previous attempts to perform transport measurements on Mn₁₂ SMMs.