Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)
O 55.15: Poster
Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F
X-Ray Absorption (XAS) and Magnetic Circular Dichroism (XMCD) Measurements of Mn6Cr Single-Molecule-Magnets Adsorbed on Various Surfaces — •Fabian Merschjohann1, Aaron Gryzia1, Armin Brechling1, Marc D. Sacher1, Ulrich Heinzmann1, Maik Heidemeier2, Thorsten Glaser2, Sönke Voss3, Mikhail Fonin3, Michael Burgert3, Ulrich Rüdiger3, and Eberhard Goering4 — 1Dep. of Physics, Bielefeld University — 2Dep. of Chemistry, Bielefeld University — 3Dep. of Physics, Konstanz University — 4MPI für Metallforschung, Stuttgart
We report on the electronic configuration of Mn6Cr-Single-Molecule Magnets (SMM) adsorbed on various surfaces. We investigated the substrate/molecule interaction, in particular the exchange of the electrons with the substrate. The manganese atoms of the Mn6Cr-SMM are trivalent. X-Ray absorption measurements at the Mn-L2- and L3-edge indicated a certain amount of divalent Mn-atoms. This suggests a reduction of the Mn6Cr molecules due to an electron transfer to the substrate. This transfer depends on the electronic configuration of the substrate material. Thus we investigated Mn6Cr-SMM adsorbed on insulating (SiO2), metallic (Au) and semiconducting (Highly Ordered Pyrolytic Graphite HOPG) materials. To determine the fraction of MnII- and MnIII-ions we calculated the measured spectral shape by using di- and trivalent reference spectra. We will also show XMCD measurements of the adsorbed SMM performed at BESSY in Berlin which reflect the expected magnetic configuration of Mn and Cr.