| 摘要 |
A thin-film magnetic head has a magnetic lower core layer and a magnetic upper core layer formed on the lower core layer with a nonmagnetic gap layer provided therebetween, and the lower core layer and the upper core layer are opposed on an opposing surface which faces a recording medium. The upper core layer includes a leading region extending from the opposing surface towards the rear portion away from the recording medium and having a track width TW, a middle region extending from the leading region towards the rear portion and having a width larger than the track width TW, and a trailing region extending from the middle region towards the rear portion and having an increasing width. The edges at the boundary between the leading region and the middle region are rounded.
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