Abstract
Bit patterned media (BPM) recording has been studied as one of the possible candidates for future perpendicular magnetic recording. For the basic R/W evaluating of BPM system, small areas of media samples are suitable in most cases. A static tester is useful to measure such small areas of BPM to evaluate their read-write characteristics. We have prepared a tester, and found that measurement with write synchronization was possible. We report here the experimental results obtained from investigations into the write-margin measurements of the BPM. A position margin of 50∼71 % of the dot period was confirmed, and we found the margin loss was related to the formation of multi-domain dots.
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