The magnetic properties and recording characteristics of longitudinal thin film media with a CoCr37 interlayer between the Co-alloy magnetic layer and the Cr underlayer were investigated. It was found that the coercivities and S/N of the media with a CoCr interlayer were higher than those of the media without a CoCr interlayer. This is because the media with a CoCr interlayer have better crystallographically-ordered layers than the media without a CoCr interlayer.
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