| 摘要 |
Embodiments of the invention provide a magnetic head (magnetic disk storage) which does not erase data on a recording medium even when a stray field is applied. In one embodiment, the head has a structure that d1=<t1 and d2=<t2 are satisfied where d1 denotes the positional difference between edges of an auxiliary pole and an upper shield in the cross-track direction, d2 denotes the positional difference between edges of the upper shield and a lower shield in the cross-track direction, t1 the film thickness of the auxiliary pole or upper shield, whichever magnetic layer is larger in cross-track width, and t2 the film thickness of the upper shield or lower shield, whichever magnetic layer is larger in cross-track width.
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