Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1998-03-12
2000-08-22
Klimowicz, William J.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 539
Patent
active
061081663
ABSTRACT:
A current-pinned spin valve sensor includes a soft ferromagnetic free layer having a first thickness, a soft ferromagnetic pinned layer having a second thickness less than the first thickness, a copper layer sandwiched between the free and the pinned layer, and a current source coupled to the free layer, pinned layer, and copper layer to provide a biasing current that generates a magnetic field of sufficient strength to saturate the pinned layer. Preferably, the free layer and pinned layer selected from a group of materials consisting of essentially Permalloy, Cobalt, Iron-Cobalt, and soft Cobalt-based ferromagnetic alloys. Also preferably the free layer has an Mrt of at least 0.3 memu/cm.sup.2 and the pinned layer has a Mrt of at most 0.28 memu/cm.sup.2, and such that the ratio of the Mrt of the free layer to the Mrt of the pinned layer is in the range of 2-10. The biasing current through the sensor is preferably at least 4 mA. The biasing current creates a magnetic field which creates the proper magnetization in the pinned layer without the need for an antiferromagnetic (AFM) layer in contact with the pinned layer.
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Kallman Nathan N.
Klimowicz William J.
Read-Rite Corporation
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