Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-10-02
2007-10-02
Chen, Tianjie (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
10945687
ABSTRACT:
A magnetic head that includes a spin valve sensor of the present invention which may be a CIP or CPP device. The sensor includes a free magnetic layer that is comprised of CoFeCu. In certain embodiments the free magnetic layer may also include a sublayer of NiFe. The CoFeCu free magnetic layer preferably includes Fe in a range of 5-20 at. % and Cu in a range of 1-10 at. %. The sensor may also include a cap layer of the present invention that is comprised of ZnOx/TaOx. The CoFeCu free magnetic layer of the present invention provides improved sensor performance characteristics of reduced coercivity and generally similar GMR as compared to the prior art. Where the ZnOx/TaOxcap layer is utilized, increased GMR is obtained. Thus a magnetic head of the present invention that includes both a CoFeCu free magnetic layer and a ZnOx/TaOxcap layer demonstrates reduced coercivity and increased GMR.
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IPCOM1959ID: Double Magnetic Tunnel Junction with Large Spin Diffusion Length Free Layer, published Sep. 22, 2003.
Gill Hardayal Singh
Zeltser Alexander M.
Chen Tianjie
Guillot Robert O.
Hitachi Global Storage Technologies - Netherlands B.V.
Intellectual Property Law Offices
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