Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Magnetic Particles/Clusters I
MA 2.9: Vortrag
Montag, 26. März 2007, 12:15–12:30, H10
Finite Size Effects in ultrathin hard magnetic FePt Films — •Felix Kurth, Martin Weisheit, Ludwig Schultz, and Sebastian Fähler — IFW Dresden, P. O. Box 270116, 01171 Dresden
L10 ordered FePt is considered a promising material as a candidate for future ultra-high density perpendicular magnetic recording media. In this talk the focus will be on the effect of the reduced size on ordering and hard magnetic properties of epitaxial FePt nanogranular films in the thickness range from 0.5 to 10 nm grown on MgO(100). 10 nm thick films reach a coercivity up to 7.3 T at room temperature. The influence of a reduced size on the heat absorption and magnetic properties as well as on composition are examined. The understanding of these finite size effects allows to reduce the thickness significantly resulting in highly ordered particles (µ0 HC = 5.5 T at 10 K), but with superparamagnetic behaviour at room temperature.