We update our continuous effort to optimize the microstructures and magnetic properties of FePt-X granular films to achieve an ideal media structure on glass substrates for heat-assisted magnetic recording. For segregant X, we investigated C, SiO2 , TiO2 and their mixtures. While FePt-C granular films show excellent inplane granular structure for the thickness (t) smaller than 6 nm, a second layer appears for rm t > 6 nm. On the other hand, FePt-TiO2 granular film shows a columnar structure with a smooth surface, but the inplane morphology is interconnected. To enhance the phase separation and realize the laterally isolated columnar structure, we mixed the segregant materials of SiO2 or TiO2 with C. We also used the thin FePt-C films as templates for FePt-X(rm X=rm SiO2 and TiO2) since the FePt-C showed good particle separation with the fine particle size. Based on these experimental results, we discuss how to attain the ideal media structure for heat-assisted magnetic recording.
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