Abstract
The L10 FePt phase material has potential applications for magnetic recording and permanent magnets due to its high magnetocrystalline anisotropy energy density. The heat treatment of [Fe/Pt]n multilayer films is one approach to form the L10 FePt phase at a lower processing temperature, which is highly desirable for its applications. This paper reports the influence of film total thickness (8–100 nm) on the structure and magnetic properties of annealed [Fe/Pt]n multilayer films. A novel technique based on hollow cone dark field transmission electron microscopy is used to determine the L10 phase fraction and grain size in the annealed films. It was found that the L10 phase fraction and grain size, ordering, and magnetic properties are strongly dependent on the total film thicknesses. An L10 FePt phase fraction close to 100% is achieved for a thick [Fe/Pt]n multilayer film (100 nm) annealed at 400 °C for 1 h, while a value of only 36% is achieved for a thin film (8 nm) annealed at the same condition. In this work the L10 FePt phase nucleation density is also presented. These results suggest that the L10 phase formation is nucleation limited, and that the subsequent growth of L10 phase grains also strongly influences the structure and magnetic properties of the annealed films.
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