Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.1: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

An Optimized Method for the Deposition of Mn₁₂ Single-Molecule Magnets on the Au(111) Surface via a Short Acidic Linker — •Michael Burgert, Sönke Voss, Mikhail Fonin, Ulrich Groth, and Ulrich Rüdiger — Universität Konstanz, 78457 Konstanz

Mn₁₂ single-molecule magnets (SMMs) have attracted much attention during the past decade due to their unique magnetic properties. At very low temperatures (∼2K) Mn₁₂-acetate and its derivatives exhibit a magnetic hysteresis of pure molecular origin without any magnetic long-range ordering effects. Quantum tunneling of magnetization shows up in terms of steps in the hysteresis loop of SMMs. The magnetic properties of bulk SMMs have been determined to a large extent during the past years. However, experiments using isolated Mn₁₂ clusters are still rare. In this contribution we present a modified deposition technique, which offered the electronic characterisation of monolayers of Mn₁₂-clusters by scanning tunneling microcopy (STM), x-ray absorption (XAS) and scanning tunnelling spectroscopy (STS). This technique is based upon a two step procedure, in which the surface is functionalized with a short conducting linker like e.g. mercaptotetrafluorbenzoic acid. The Mn₁₂-complexes are fixed to the functionalized Au(111)-surface via a ligand-exchange-reaction. As an example for the common use of these technique we demonstrate the deposition of new Mn₁₂ derivatives on the functionalized Au(111)-surface. Furthermore we present its chemical synthesis and the structural as well as magnetic characterisation