Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 19: Poster I: Multiferroics (jointly with MA, DF, KR, TT), Spins in organic materials (jointly with MA), FePt Nanoparticles (jointly with MA, MM)
DS 19.1: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Spin-resolved photoemission spectroscopy of [Mn6IIICrIII]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 [Mn6IIICrIII]3+ deposited on surfaces are studied. This molecule exhibits a large spin ground state of ST=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 [Mn6IIICrIII]3+ SMM after excitation with circularly polarized synchrotron radiation has been measured in the paramagnetic phase at selected excitation energies in the Mn-L2,3 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-L2,3 edge are presented as well.