| 摘要 |
A top pole layer has a first portion and a second portion. The first portion has an end located in an air bearing surface, has a constant width equal to a write track width, and includes a pole portion. The second portion is coupled to the other end of the first portion and includes a yoke portion. The first portion, a write gap layer, and a part of the bottom pole layer closer to the write gap layer have an equal width in a region where the first portion of the top pole layer and the bottom pole layer are opposed to each other via the write gap layer. The thickness of the first portion of the top pole layer in a region extending from the air bearing surface to a predetermined position is smaller than the thickness of the other part of the top pole layer adjacent to this region.
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