Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2005-12-27
2005-12-27
Watko, Julie Anne (Department: 2653)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
06980406
ABSTRACT:
A giant magneto-resistive (GMR) sensor for a magnetic head for a hard disk drive is disclosed. The sensor includes: a free magnetic layer; a bias layer that provides a bias magnetic field to the free magnetic layer and a bias pinning layer that provides a stabilizing magnetic field to the bias layer and that has a width substantially longer than the width of the free magnetic layer. Embodiments of the invention may further include an anti-ferromagnetic layer having a width substantially longer than the width of the free layer, or both an anti-ferromagnetic layer and a pinned magnetic structure each having a width substantially longer than the width of the free layer.
REFERENCES:
patent: 6671139 (2003-12-01), Carey et al.
patent: 2003/0137781 (2003-07-01), Carey et al.
patent: 2003/0179514 (2003-09-01), Pinarbasi
Guillot Robert O.
Hitachi Global Storage Technologies - Netherlands B.V.
Intellectual Property Law Offices
Watko Julie Anne
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