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Berlin 2008 – scientific programme

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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 18.50: Poster

Tuesday, February 26, 2008, 15:15–18:30, Poster E

Structure and magnetic properties of iron-platinum particles with iron oxide shell. — •Lubna Basit1, Ibrahim Shukoor1, Vadim Ksenofontov1, Wolfgang Tremel1, Gerhard H. Fecher1, Claudia Felser1, Sergei A. Nepijko2, Gerd Schönhense2, and Michael Klimenkov31Institut of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, 55099 Mainz — 2Institut of Physics, Johannes Gutenberg - University, 55099 Mainz — 3Institut of Materials Research I, Forschungszentrum Karlsruhe, 76021 Karlsruhe

Nanoparticles of solid solution FexPt1−x, where 0.25≥ x ≥ 0 with Fe2O3 shell were synthesized and characterized by high-resolution transmission electron microscopy, energy dispersive X-ray analysis, electron energy loss spectroscopy, Mößbauer spectroscopy and magnetometry. The magnetic properties, of such two-phase particles are interesting because their core is antiferromagnetic or paramagnetic (at very small values of x) whereas the shell is ferrimagnetic. The size of the particles was in the range of several nanometers. 57Fe Mößbauer spectroscopy revealed a blocking temperature of about 100 K above which the particles are superparamagnetic. Towards lower temperatures, the magnetic characteristics showed an increase of magnetic rigidity. The saturation magnetization increases by a factor of 1.4 between room temperature and 5 K.

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