Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-10-16
2007-10-16
Castro, Angel (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S324000, C360S324110, C360S324120, C029S603010, C029S603070
Reexamination Certificate
active
11455204
ABSTRACT:
A magnetic head having a spin valve sensor that is fabricated utilizing an Al2O3, NiMnO, NiFeCr seed layer upon which a typical PtMn spin valve sensor layer structure is subsequently fabricated. The preferred embodiment fabrication process of the NiFeCr layer includes the overdeposition of the layer to a first thickness of from 15 Å to 45 Å followed by the etching back of the seed layer of approximately 5 Å to approximately 15 Å to its desired final thickness of approximately 10 Å to 40 Å. The Cr at. % composition in the NiFeCr layer is preferably from approximately 35 at. % to approximately 46 at. %. The crystal structure of the surface of the etched back NiFeCr layer results in an improved crystal structure to the subsequently fabricated spin valve sensor layers, such that the fabricated spin valve exhibits increased ΔR/R and reduced coercivity.
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Research Disclosure, Apr. 2000, “Lower HC Through Surface Modification.” Disclosed by International Business Machines Corporation 432117.
Castro Angel
Guillot Robert O.
Intellectual Property Law Offices
Magee Christopher R.
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