| 摘要 |
A top pole layer in a write head includes, in a pole portion, a first layer having surfaces one of which is adjacent to a write gap layer, a second layer having surfaces one of which is adjacent to the other surface of the first layer, and a third layer having surfaces one of which is adjacent to the other surface of the second layer. The first to third layers have different saturation flux densities such that the closer the layer to the write gap layer, the higher saturation flux density.
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