Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-03-28
2009-11-10
Klimowicz, William J (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S321000, C360S322000
Reexamination Certificate
active
07616411
ABSTRACT:
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 F1a second magnetic layer F2and a coupling layer sandwiched between F1and F2. The first magnetic layer F1extends to the ABS while the other sensor layers terminate at the recessed front edge. In this way, the F1layer 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 F1and F2to 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 (F2).
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English-machine translation of JP 2003-077107 A to Ishii, published on Mar. 14, 2003.
Hitachi Global Storage Technologies - Netherlands B.V.
Klimowicz William J
Zilka-Kotab, PC
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