| 摘要 |
A current perpendicular to plane (CPP) magnetoresistive sensor having a front edge that is recessed from the air bearing surface (ABS). The sensor includes a pinned layer structure a free layer structure and a spacer layer sandwiched between the free layer and the pinned layer. The free layer is an AP coupled structure that includes a first magnetic layer F 1 a second magnetic layer F 2 and a coupling layer sandwiched between F 1 and F 2 . The first magnetic layer F 1 extends to the ABS while the other sensor layers terminate at the recessed front edge. In this way, the F 1 layer acts as a flux guide that reacts to a magnetic field from a magnetic medium. The AP coupled structure of the free layer allows each magnetic layer F 1 and F 2 to be thicker than would be possible in a conventional single layer free layer, which increases the GMR effect of the sensor and increases the effectiveness of the flux guide (F 2 ).
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