Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.82: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Growth Kinetics and Magnetic Properties of Alloyed Fe/Co Nanoparticles — •Klaus Wojczykowski1, Daniela Sudfeld2, Inga Ennen2, Andreas Hütten2, and Peter Jutzi1 — 1Inorganic Chemistry III, Department of Chemistry, University of Bielefeld, Universitätsstr. 25, D-33615 Bielefeld, Germany — 2Thin Films and Nanostructures, Department of Physics, University of Bielefeld, Universitätsstr. 25, D-33615 Bielefeld, Germany
Future applications of magnetic nanoparticles will require well-defined magnetic properties of these systems. Monodisperse Nanoparticles of the high-moment iron-cobalt-alloy were synthesized by the co-decomposition of metalorganic cobalt and iron precursors in solution. We found a strong dependance between particle composition and precursor decomposition kinetics. The use of Co2(CO)8 as cobalt precursor and Fe(CO)5 as iron precursor can lead to a core shell structure with iron enriched at the particle surface. Faster decomposing iron precursors of the type Fe(CO)4L, where L means donor-ligand, can reverse the situation. Microstructural and magnetic methods are used to elucidate the true structure of the alloyed Fe/Co system.