Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 7: Magnetische dünne Schichten II
MA 7.12: Vortrag
Freitag, 4. März 2005, 18:00–18:15, TU H1012
On the correlation of intrinsic properties, microstructure and hard magnetic properties of FePt films — •Sebastian F ähler, Martin Weisheit, Volker Neu, and Ludwig Schultz — IFW Dresden, Helmholtzstraße 20, 01069 Dresden
Epitaxial, L10 ordered FePt films can reach a coercivity up to 5.6 T, a fraction of about 50% of the anisotropy field of 11.6 T. This is significant higher than the fraction of 30% typically reached at best in permanent magnets. Thus these granular films are ideally suited to study the switching behaviour of permanent magnets.
Thin FePt films had been prepared by pulsed laser deposition. In order to vary microstructure and intrinsic magnetic properties, films had prepared at different temperature, composition and film thickness. Resulting magnetic properties are strongly correlated to these growth conditions. For a detailed analysis, the domain pattern of some films had been measured by MFM and angular and temperature dependence of coercivity is analysed. These results show that domain reversal in FePt films reaching the highest coercivity is governed by nucleation.