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DF: Fachverband Dielektrische Festkörper

DF 9: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques

DF 9.1: Poster

Dienstag, 27. März 2012, 12:15–15:15, Poster A

Spin-resolved photoemission spectroscopy of [Mn₆^IIICr^III]³⁺ single-molecule magnets (SMM) deposited on surfaces and of Mn compounds as reference substances, cross comparison with XMCD — •Andreas Helmstedt¹, Aaron Gryzia¹, Niklas Dohmeier¹, Norbert Müller¹, Armin Brechling¹, Marc Sacher¹, Ulrich Heinzmann¹, Veronika Hoeke², Erich Krickemeyer², Thorsten Glaser², Mikhail Fonin³, Samuel Bouvron³, Philipp Leicht³, Thomas Tietze⁴, and Manfred Neumann⁵ — ¹Faculty of Physics, Bielefeld University — ²Faculty of Chemistry, Bielefeld University — ³Department of Physics, University of Konstanz — ⁴Max-Planck-Institut für Intelligente Systeme, Stuttgart — ⁵Department of Physics, University of Osnabrueck

The properties of the Mn-based single-molecule magnet [Mn₆^IIICr^III]³⁺ deposited on surfaces are studied. This molecule exhibits a large spin ground state of S_T=21/2 and contains six Mn centres in two bowl-shaped Mn₃-triplesalen units linked by a hexacyanochromate. A preparation method for large-scale homogeneous samples needed for sample scanning to avoid radiation damage will be presented. The spin polarization of Auger electrons emitted from the manganese centres in [Mn₆^IIICr^III]³⁺ SMM after excitation with circularly polarized synchrotron radiation has been measured in the paramagnetic phase at selected excitation energies in the Mn-L_2,3 region. These results will be compared to XMCD data obtained at approx. 2K and 7T. Spin polarization data from Mn₂O₃ and Mn(II)acetate references after excitation at the Mn-L_2,3 edge are presented as well.