Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2005-05-31
2009-08-25
Miller, Brian E (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S324200, C324S207210
Reexamination Certificate
active
07580228
ABSTRACT:
A CPP MR sensor includes a sense layer with a smoothly curving perimeter, lowering edge effects and Barkhausen noise. For example, a circular or oval CPP sensor stack can be defined, or the sensor layers can be milled to have a tapered track width that is narrower adjacent media facing surface, to avoid sharp corners at that media facing surface after lapping which has been monitored for resistance change to terminate at the correct plane. Single domain sensor layers, such as free, pinned, and bias layers, can be produced with this technique, increasing stability, lowering noise and increasing magnetoresistance of the sensor. A smoother rotation of the free layer magnetic moment, and a more linear signal, can also be provided. An antiferromagnetic bias layer can also be eliminated due to the reduced edge effects of the free layer.
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