In this work we have developed a stacked Ru underlayer and have studied its effects on the improvement of recording performances for CoCrPt-SiO2 granular-type dual-layer perpendicular media. The c-axis distribution ΔΘ50 of the 13.2 nm thick stacked Ru underlayer was 4.5°, which was about 33% smaller than that of Ru monounderlayer with the same thickness. The use of stacked Ru underlayer realized that the recording layer of granular-type media consisted of segregated fine-grain structure with oxide grain boundaries. The signal-to-media-noise ratio (SNR) improvement achieved by the use of the stacked Ru underlayer was indicated when it was compared with the use of Ru monounderlayers. Furthermore, the SNR for monopole head of 8.5 dB at 480 kfci and D50 of 356 kfci were obtained by optimizing the structure of stacked Ru underlayer.
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Mukai et al. (2005) studied this question.
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