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Effect of Dual-Magnetic-Layer on Performance of CoCrPt-SiO2 Perpendicular Media

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2 Author(s)
Hirayama, Yoshiyuki ; Central Res. Lab., Hitachi Ltd., Odawara ; Tamai, Ichiro

CoCrPt-SiO2 perpendicular recording media have been investigated in order to increase media signal-to-noise ratio (SNR) by introducing a dual-magnetic-layer structure into the CoCrPt-SiO2 recording layer. The dual-magnetic-layer structure consists of low- and high-Ms granular layers. The magnetic properties and recording performances of two kinds of dual-magnetic-layer media, one with a low-Ms bottom layer and another with a low-Ms top layer, were measured. The coercivity of the low-Ms bottom medium is higher than that of the low-Ms top medium, although they have the same thermal stability (KuV/kB T). We showed that using the low-Ms bottom layer gives a higher SNR. That is to say, SNR was improved by 3 dB compared with that of the high-Ms single-magnetic-layer medium, and it was even higher than that of the low-Ms single-magnetic-layer medium. It is thus concluded that the dual-magnetic-layer structure with the low-Ms bottom layer is effective in increasing SNR of perpendicular media

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 6 )