Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 20: Magnetic Thin Films II
MA 20.10: Vortrag
Mittwoch, 28. März 2007, 17:30–17:45, H5
fcc and fct FePt: magnetic moments, magnetic moment anisotropy and their relation to magnetocrystalline anisotropy — •Kai Fauth1, Carolin Antoniak2, Sven Bornemann3, Jan-Ulrich Thiele4, Ulf Wiedwald5, Marina Spasova2, Fabrice Wilhelm6, Andrei Rogalev6, Hans-Gerd Boyen5, Jan Minar3, Hubert Ebert3, Paul Ziemann5, Michael Farle2, and Gisela Schütz1 — 1MPI für Metallforschung, D-70569 Stuttgart — 2Universität Duisburg-Essen, Fachbereich Physik, D-47048 Duisburg — 3LMU München, Department Chemie und Biochemie, D-81377 München — 4Hitachi Global Storage Technologies, San Jose Research Center, San Jose, CA 95135, USA — 5Universität Ulm, Abteilung Festkörperphysik, D-89069 Ulm — 6ESRF, Polygone Scientifique Louis Néel, F-38000 Grenoble
The transition from the disordered fcc FePt alloy to the the chemically ordered fct L10 phase is accompanied by the occurrence of very large magnetocrystalline anisotropy. L3,2 edge X-ray magnetic circular dichroism was used to investigate Fe and Pt magnetic moments as well as their anisotropy for both, disordered and ordered FePt, respectively. The orbital magnetic moments at both, Fe and Pt sites are maximized along the easy magnetization axis in the L10 phase. Calculated magnetic moments were determined from fully relativistic band structure calculations and display the same anisotropy behaviour. In addition, the calculations indicate that chemical ordering is the dominant contribution to magnetocrystalline anisotropy as compared to tetragonal lattice distortion.