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CGC Perpendicular Recording Media With CoCrPt-SiO _2 Alloy as Granular Layer

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9 Author(s)
Sonobe, Y. ; HOYA Magnetics, Singapore ; Tham, K.K. ; Wu, L. ; Umezawa, T.
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We investigated a new class of coupled granular/continuous (CGC) perpendicular media consisting of CoCrPt-SiO2 granular layer with magnetically decoupled small grains. By changing the number of Co/Pd bi-layers in the continuous layer, the degree of exchange coupling can be systematically controlled. The introduction of Co/Pd multilayer improved the nucleation field (Hn) from -570 to -1670 Oe and KuV/kB T values from 67 to 97. Compared to the base granular media, the CGC media had 1 dB gain in signal-to-noise ratio (SNR) as well as 14 dB gain in write-ability (OW). Moreover, the output decay was reduced from -0.11 to -0.035 dB per decade. In CGC approach, a more appropriate strength of exchange coupling can be introduced that yields the significant improvement in both SNR and thermal stability

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Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 10 )