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The microscopic magnetic characteristics of CoCrPt-patterned media after magnetic recording by a ring head were investigated. The media consists of two rows of aligned CoCrPt dots with a diameter of 40 nm. The magnetization reversal of each dot is clearly observed by magnetic force microscopy (MFM). A few misreversed dots were observed in the written "bit" patterns. The distribution of coercivity H c was investigated by MFM using dot-by-dot analysis. It was found that H c is about 4 kOe on the average with a wide distribution ranging from 0.5 to 7.5 kOe. This large distribution of H c causes these magnetization reversal defects. One possible origin of the large H c distribution is the grain boundary observed in each grain of the CoCrPt layer.
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Kamata et al. (2007) studied this question.
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