Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Magnetic Particles/Clusters I
MA 2.11: Vortrag
Montag, 26. März 2007, 12:45–13:00, H10
Magnetic moments in FexPt100−x nanoparticles vs. bulk — •Kai Fauth — MPI für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany
Due to its strong magnetocrystalline anisotropy FePt is actively being investigated as a potential material for ultrahigh density magnetic data storage. A survey is given on various approaches to generate appropriate nanoscale FexPt100−x particles and their magnetic properties in terms of magnetization and magnetic anisotropy are given as a function of alloy composition. Quite generally we find considerably reduced magnetic moments in sub 10 nm FexPt100−x nanoparticles compared to those determined for epitaxially grown films of corresponding stoichiometry. We discuss mechanisms such as surface magnetic anisotropy and surface segregation as posible sources of our experimental findings.