Study on recording beyond 10 Gbit/in.2 with Co–Cr based perpendicular recording media

Recording of beyond 10 Gbit/in.2 was studied with Co–Cr based perpendicular recording media and ring heads. A simple recording simulation based on an M–H loop sheared by the demagnetizing field in the film suggested that a steeper M–H loop slope in the medium results in a higher output and resolution. It was found that recording with a metal in gap head with a gap length of as small as 0.15 μm on a Co–Cr20–Nb4–Pt5 medium with an M–H loop slope of 1.5/4π emu/Oe cm3 exhibited a high output and a high resolution. The obtained high signal-to-noise ratio and resolution suggested a possibility of recording beyond 10 Gbit/in.2 for a track pitch of 0.4 μm.