| 摘要 |
A bottom pole layer incorporates a pole portion layer and a yoke portion layer. A top pole layer incorporates a pole portion layer and a yoke portion layer. The pole portion layer of the bottom pole layer, a write gap layer, and the pole portion layer of the top pole layer have cross sections of the same shapes, the cross sections being parallel to the top surface of a substrate. The aggregate of both pole portion layers and the write gap layer includes a first portion having a width that defines the track width and a second portion having a width greater than the width of the first portion. Where the width of the first portion is W and the distance from a medium facing surface ABS to the interface between the first portion and the second portion is L, L/W falls within a range of 2 to 5 inclusive. Where the area of the cross section of the aggregate parallel to the top surface of the substrate is S, S/(WxL) falls within a range of 5 to 40 inclusive.
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