Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-06-05
2007-06-05
Heinz, A. J. (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
10652835
ABSTRACT:
A Current-Perpendicular-to-Plane (CPP) Giant Magneto-Resistance (GMR) sensor (700/800) has either a composite film (708) embedded into a ferromagnetic reference layer (710) or a composite film (806) embedded into a ferromagnetic keeper layer (804). The embedded composite film is deposited by sputtering from a ferromagnetic metallic target and a non-magnetic oxide target simultaneously or sequentially. Varying sputtering powers of the ferromagnetic metallic and non-magnetic oxide targets leads to various volume fractions of ferromagnetic metallic and non-magnetic oxide phases. By carefully adjusting these volume fractions, the product of junction resistance and area of the CPP GMR sensor (700/800) can be finely tuned to a designed value and thus provide optimum read performance of the CPP GMR sensor (700/800) for magnetic recording at ultrahigh densities.
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Chambliss Bahner & Stophel
Heinz A. J.
Hitachi Global Storage Technologies - Netherlands B.V.
Lynch David W.
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