Low-noise media using double-layer CoNiCr thin films for longitudinal recording

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Abstract
A low-noise medium using double-layer CoNiCr thin films for high-density longitudinal magnetic recording has been developed. This medium consists of a Cr underlayer, a first CoNiCr layer, a Cr interlayer, and a second CoNiCr layer. In this study, the effects of Cr interlayer on the magnetic properties and read/write characteristics are investigated. Coercivity increases while remanence thickness product and coercive squareness decrease with increasing Cr interlayer thickness. The media noise is reduced by the presence of the Cr interlayer, and when the sum of the thicknesses of the CoNiCr layers is fixed, the minimum in the media noise and the maximum in the signal-to-noise ratio are obtained in the case when the two CoNiCr layers are of equal thickness. Because of the great reduction in the media noise, we have obtained signal-to-noise ratio of 35.5 dB at 33 kfci, which is greater than that of a single-layer medium by 4 dB. Also, the data suggest that the reduction in the media noise is due to a reduction in the interlayer coupling, by introducing the Cr interlayer, which is accompanied by a reduction in the coercive squareness.

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