Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 31: Magnetic Particles and Clusters I
MA 31.6: Vortrag
Donnerstag, 26. März 2009, 11:30–11:45, HSZ 401
Detailed study on oxidation behavior of FePt thin film and nanoparticles — •Luyang Han1, Kuerbanjiang Balati1,2, Ulf Wiedwald1, and Paul Ziemann1 — 1Institut für Festkörperphysik, Universität Ulm, A.-Einstein-Allee 11, 89081 Ulm, Germany — 2Institut für Mikro- und Nanomaterial, Universität Ulm
FePt nanoparticles and thin films attract great attention due to their potential application as magnetic data storage media [1]. In this study the oxidation of FePt nanoparticles and an epitaxial FePt reference film are investigated in detail. The nanoparticles are prepared by means of reverse micelles [2]. Oxidation is tracked in detail using X-ray photoelectron spectroscopy and a core-shell model is established to extract the oxide layer thickness. During the oxidation process a layer of Fe2O3 is formed at the surface, while Pt atoms remain metallic. After oxygen exposure of 108 L chemically disordered FePt particles start to oxidize, while the partially ordered particles after in-situ annealing at 950 K show only slight oxidation after 1010 L oxygen exposure. Similar behavior is observed for FePt thin films, indicating that the formation of the chemically ordered L10 structure reduces the oxidation speed significantly.
[1]S. Sun, Adv. Mater., 18, 393, (2006)
[2]A. Ethirajan et al., Adv. Mater., 19, 406, (2007)