Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.35: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Investigation of the electronic structure of LuFe2O4 by means of XPS, XAS, XES and calculations — •Michael Raekers1, Christian Taubitz1, Karsten Kuepper2, Stephen J. Blundell3, Dharmalingam Prabhakaran3, and Manfred Neumann1 — 1Universität Osnabrück, FB Physik, Barbarastr.7, 49069 Osnabrück, Germany — 2FZ Dresden-Rossendorf, Dresden, Germany — 3Clarendon Laboratory, University of Oxford, Oxford, UK
The use of magneto electric coupling and multi ferroics in spintronics has led to an intense interest in ferro electric magnets. The spinel LuFe2O4 is a very promising candidate for such applications because of its giant room temperature magneto dielectric response, which suggests a strong coupling between spin moment and electric dipole. The resulting giant magneto capacitance is due to charge ordering of iron ions. A complex two dimensional ferri magnetism plays an important role for the multi ferroic properties of LuFe2O4. We determine the electronic structure by means of XPS, XAS and XES. Experimental data is compared with multiplet calculations, which are performed with the TT multiplet program taking into account charge transfer and the crystal field. The comparison with the experiment shows the occupation of tetrahedral and octahedral sites of the crystal.