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Recording characteristics of partially oxidized Fe-Co media were improved remarkably by the introduction of an Fe-Co under-layer. In this paper, the effects of the coercive force of the Fe-Co under-layer on recording characteristics were investigated using a ring-type head. The stronger the coercive force of the under-layer, the higher the reproduced voltage and recording density 050, and the superior C/N and overwrite characteristics. Waveforms of a medium whose Fe-Co under-layer possessed a high coercive force were sharper than those of a medium with low coercive force. We consider that the broadening of the waveforms depends mainly on interactions between the head and Fe-Co under-layer.

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