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 mu m on a Co-Cr-20-Nb-4-Pt-5 medium with an M-H loop slope of 1.5/4 pi emu/Oe cm(3) 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 mu m. (C) 1999 American Institute of Physics. [S0021-8979(99)68208-1].