Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2005-06-07
2005-06-07
Heinz, A. J. (Department: 2653)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
06903906
ABSTRACT:
The invention provides a magnetic domain controlling structure wherein a lamination stack M1adjacent to a magnetoresistive stack of a GMR, CPP-GMR or TMR magnetic head has at least two magnetic films14and16anti-ferromagnetically coupled through a non-magnetic film15, or the lamination stack M2disposed on the end portions of the free layer of the magnetoresistive stack of the GMR magnetic head has a magnetic layer anti-ferromagnetically coupled to the free layer2through the non-magnetic film27. Ferromagnetic film deposition dead zone area problems and the consequent problem of film rippling in free layer portions that reduces element sensitivity are prevented, as is the problem of increased error from read drift in the magnetic field exchange coupling method, resulting in a highly stable, highly sensitive MR head with no loss of magnetic field intensity.
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Kojima Shuichi
Miyamoto Norifumi
Morinaga Akira
Nishioka Koichi
Ohtsu Takayoshi
Heinz A. J.
Hitachi , Ltd.
Townsend and Townsend / and Crew LLP
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