btrduction rhtinuing to increase the dak-transfer rate of h d d i s k drives is becoming much more difficult. These drives are expected to operate at over 100 MB/s in the near fiaurr, but dynamic coercivity, d i c h increases rapidly at such high hquencies [IJ], might prevent the recording head &om frequency region was measured by using the short-pulse-field method [ I ]. However, we pointed out h u g h numerical calculations that H, measured by a shot-pdscfield with slow rise &ne was larger
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