Recording performance of granular-type FePt-MgO perpendicular media

In this study, the double-layered disk has a film stack structure of [MgO x nm/FePt y nm]/sub n/ /MgO 4 nm/SiO2 4 nm/Fe-Ta-C 200 nm. The disks were fabricated by sputtering onto 2.5-inch glass disc substrate. Magnetic properties were measured by AGFM and P-MOKE and recording performance was studied by spin-stand with ring head designed for 50 Gbsi longitudinal recording.