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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.3: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
Preparation of Monolayers of Mn6Cr Single-Molecule-Magnets on different Substrates and characterization by means of nc-AFM — •Aaron Gryzia1, Armin Brechling1, Hans Predatsch1, Ulrich Heinzmann1, and Thorsten Glaser2 — 1Faculty of Physics, Bielefeld University, D-33615 Bielefeld — 2Faculty of Chemistry, Bielefeld University, D-33615 Bielefeld
The preparation of a highly ordered monolayer of Single-Molecule-Magnets (SMM) is one of the main preconditions for a technical application of these molecules. The adsorption of these SMMs on surfaces is associated with difficulties due to the often low chemical stability of these molecules in the vicinity of a surface.
The used Mn6Cr-complex [1] has a C3-symmetry and a spin ground state of St=21/2. This complex is a trication and needs therefore counter ions for electrical charge compensation. Tetraphenylborate, lactate and perchlorate came into consideration for this function.
Mn6Cr-SMMs were prepared on different substrates by a droplet technique in air at room temperature. The samples were characterized by means of an AFM operating in non-contact mode, using tips with cone radii of approx. 2 nm.
An island-like growth was observed on SiO2- and Si3N4-substrates, whereas on HOPG and mica the Mn6Cr-SMM adsorbates preferred a layer growth. Also an influence of the used counter ions was observed on different substrates. The measured thicknesses of the layers are consistent with the Van der Waals radii of the Mn6Cr-SMMs.
[1] T. Glaser et al., Angew. Chem., 118, 6179-6183 (2006)