| 摘要 |
PROBLEM TO BE SOLVED: To overcome the problem such that the top core layer conventionally consists of a tip having a fixed width dimension and a back end of which the width dimension spreads from the tip to the backside, but this shape do not allow both non-linear transition shift(NLTS) property and over write(OW) property simultaneously to be enhanced. SOLUTION: The top core layer 20 is constituted of a tip C with a fixed width dimension (track width), a middle portion D in which the width dimension spreads from the tip C to the backside while having an angleθ1 to the side of the tip C, and a back end E which is formed from the middle portion D to the backside while having an angleθ2 to the side of the tip C. This allows both NLTS property and OW property simultaneously to be enhanced.
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