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Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Poster I

MA 10.11: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Homogenous adsorption of Mn6Cr single-molecule-magnets on substrates — •Peter Koop1, Aaron Gryzia1, Andreas Helmstedt1, Wiebke Hachmann1, Armin Brechling1, Marc Sacher1, Ulrich Heinzmann1, Veronika Höke2, and Thorsten Glaser21Molecular and Surface Physics, Bielefeld University — 2Anorganic Chemistry I, Bielefeld University

Mn6Cr is a single-molecule-magnet (SMM) consisting of two bowl-shaped compounds, each containing three Mn-atoms. These compounds are bound together by a Cr-complex. For charge neutrality, counterions have to be coupled to the SMM. Investigation of separated SMM, the molecule-substrate interaction and/or possible future applications e.g. data storage, requires preparation of monolayers or thin films. This preparation is done by solving Mn6Cr in methanol, and dropping few µl of the solution onto a 9x9 mm sized substrate. Depending on the choice of substrate Au, SiO2 (native Oxide, 50 nm Oxide), HOPG, Ru, Mn6Cr concentration, the angle of the sample while being preparated and the amount of applied solution Mn6Cr yields strongly varying kinds of assembly. On the one hand, clusters emerge in the solution just a moment before the solvent dries, depending on the concentration of Mn6Cr in the solution. On the other hand the lateral distribution of the SMM is correlated with the droplet-size, the angle of the sample during preparation and the counterions, e.g. lactate anions cause Mn6Cr to create membranes. The samples have been investigated by means of optical microscopy, SEM, surface profilometry and AFM.


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