Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-05-17
2009-12-08
Castro, Angel A. (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
07630176
ABSTRACT:
A method for forming a bottom spin valve sensor element with a novel seed layer and synthetic antiferromagnetic pinned layer and the sensor so formed. The novel seed layer comprises an approximately 30 angstrom thick layer of NiCr whose atomic percent of Cr is 31%. On this seed layer there can be formed either a single bottom spin valve read sensor or a symmetric dual spin valve read sensor having synthetic antiferromagnetic pinned layers. An extremely thin (approximately 80 angstroms) MnPt pinning layer can be formed directly on the seed layer and extremely thin pinned and free layers can then subsequently be formed so that the sensors can be used to read recorded media with densities exceeding 60 Gb/in2. Moreover, the high pinning field and optimum magnetostriction produces an extremely robust sensor.
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Horng Cheng T.
Tong Ru-Ying
Torng Chyu-Jiuh
Wang Hui-Chuan
Ackerman Stephen B.
Castro Angel A.
Headway Technologies Inc.
Saile Ackerman LLC
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