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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.85: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Investigation of [Fe₆^IIICr^III]³⁺ Molecules Deposited on Surfaces by XAS, SPES and XMCD — •Niklas Dohmeier¹, Andreas Helmstedt¹, Aaron Gryzia¹, Norbert Müller¹, Armin Brechling¹, Ulrich Heinzmann¹, Veronika Hoeke², Erich Krickemeyer², Thorsten Glaser², and Karsten Küpper³ — ¹Faculty of Physics, Bielefeld University — ²Faculty of Chemistry, Bielefeld University — ³Department of Physics, University of Osnabrueck

[Fe₆^IIICr^III]³⁺ is a heptanuclear metal-organic coordination compound containing six Fe^III ions and one Cr^III embedded in an organic environment. An airbrush-based preparation method leads to large homogeneous samples. X-ray absorption spectroscopy (XAS) was used to monitor the sample oxidation state and its reduction during the performed spin-resolved photoemission measurements (SPES). The spin polarization of the Auger electrons following the excitation with circularly polarized synchrotron light in the region of the Fe-L_2,3 absorption edge is measured to reveal information about the magnetic properties of [Fe₆^IIICr^III]³⁺. The results were compared to corresponding X-ray magnetic circular dichroism (XMCD) measurements performed at 4 K and 6.9 T. Sum rules are applied to both data sets. SPES and XMCD data for the reference material Fe₂O₃ are presented as well.