Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.26: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Influence of ligands on magnetic properties of chemically synthesized FePt-nanocrystallites — •Thomas Traußnig1, Stephan Landgraf2, Klemens Rumpf3, Petra Granitzer3, Ilse Letofsky-Papst4, Karin Wewerka4, Gerald Kothleitner4, Heinz Krenn3, and Roland Würschum1 — 1Institut für Materialphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria — 2Inst. f. Physikalische & Theoret. Chemie, TU Graz — 3Inst. f. Physik, Karl-Franzens-Universität Graz — 4Inst. f. Elektronenmikroskopie & Feinstrukturforschung, TU Graz
FePt-nanoparticles have attracted considerable interest recently with respect to possible application potentials for future storage media. FePt-particles were synthesized chemically by thermal decomposition of iron pentacarbonyl and reduction of platinum acetylacetonate. The spherical particles with a small diameter of 3.4 nm and a narrow size distribution are coated by oleic acid and oleylamine. Variation of the particle distance can be obtained by a ligand exchange process, substituting the oleic acid/oleylamine ligand shell by an octanoic acid/octylamine or an hexanoic acid/hexylamine ligand shell. The influence of the different ligand shells as well as of subsequent thermal annealing on the superpara- and ferromagnetic behaviour is studied by SQUID magnetometry.
Acknowledgement: Financial support by FWF - Austrian Science Fund (project S10405-N16) is appreciated.