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Recording and reproducing characteristics of a Co-Cr perpendicular magnetic hard disk media with a very thin Fe-Co longitudinal backlayer have been investigated by using a contact type MIG head. The Co-Cr perpendicular media with a Fe-Co backlayer provide a large reproduced output, a single peak reproduced waveform, and a high recording density. The Co-Cr/Fe-Co composite media showed a lager reproduced output and recording density than Co-Cr-Ta/Cr longitudinal medium in the small spacing region such as 600 Å.
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Onodera et al. (1991) studied this question.
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