Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)
MA 32.40: Poster
Freitag, 29. Februar 2008, 11:15–14:00, Poster E
The oxidation behavior of FePt nanoparticles in A1 and L10 phase — •Luyang Han, Kuerbanjiang Balati, Ulf Wiedwald, Lianchen Shan und Paul Ziemann — Institut für Festkörperphysik, Universität Ulm, A.-Einstein-Allee 11, 89081 Ulm, Germany
Self-assembled arrays of FePt nanoparticles attract great attention due to their potential application as magnetic data storage media[1]. For an application the chemical stability of metallic nanoparticles against environmental conditions is critical. To prepare FePt nanoparticles, a micellar method is used, with which the composition and size of the particles can be well controlled[2,3]. The oxidation behavior of the nanoparticles is investigated using X-ray photoelectron and X-ray absorption spectroscopy. The 8 nm chemically disordered A1 FePt nanoparticles show surface passivation after exposure to ambient condition for a few hours and possibly a core-shell structure is formed. After annealling at T>600∘C the metallic particles can be transformed partially to the chemically ordered L10 state, which exhibits increased resistance to oxidation.
[1]S. Sun, Adv. Mater., 18, 393, (2006)
[2]A. Ethirajan et al., Adv. Mater., 19, 406, (2007)
[3]U. Wiedwald et al., Appl. Phys. Lett., 90, 062508, (2007)