Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-12-25
2007-12-25
Castro, Angel (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
10940941
ABSTRACT:
A current-perpendicular-to-the-plane (CPP) structure magnetoresistive element includes an electrode layer contacting a magnetoresistive film. A low resistance region is defined to extend rearward along the boundary of the magnetoresistive film from the front end exposed at the medium-opposed surface of the head slider. A high resistance region is defined to extend rearward along the boundary from the rear end of the low resistance region. The high resistance region has a resistivity higher than that of the low resistance region. The high resistance region serves to restrict the path of a sensing current nearest to the medium-opposed surface. The sensing current is allowed to concentrate at a position closest to the medium-opposed surface in the magnetoresistive film. Magnetization sufficiently rotates in the magnetoresistive film near the medium-opposed surface. The CPP structure magnetoresistive element maintains a sufficient variation in the resistance. A sufficient sensitivity can be maintained.
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Oshima Hirotaka
Shimizu Yutaka
Tanaka Atsushi
Castro Angel
Fujitsu Limited
Greer Burns & Crain Ltd.
Magee Christopher R.
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