The perpendicular magnetic recording has been investigated for 20 years, whereby the head and the recording media are improved. HDD is made for the inprovement of head and media. In this inprovement, some unexpected problems such as the instability of magnetic domeins and the contac sliding occur. In this paper I will describe some problems which we encounterd for the practical of the perpendicular magnetic recording.
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M. Oshiki (1997) studied this question.
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