Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2005-03-04
2008-03-04
Klimowicz, William (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Core
C360S122000
Reexamination Certificate
active
07339763
ABSTRACT:
A disk drive thin-film write head has a first ferromagnetic pole tip that includes a pedestal pole layer and a capping layer on the pedestal pole layer. A substantial portion of the pedestal pole layer is formed of a lower-moment alloy and the capping layer is formed of a higher-moment alloy and is made thick enough to compensate for the lower-moment alloy in the pedestal pole layer. The pedestal pole layer may be a bilayer of two different NiFe alloys with the upper layer in the bilayer having a higher moment, and the capping layer may be a CoFe alloy. The width of the pedestal pole layer is substantially reduced to reduce the pole tip area exposed. The reduced pole tip area and the increased use of lower-moment alloys enable a thinner protective film to be used to protect the pole tips from corrosion.
REFERENCES:
patent: 5126907 (1992-06-01), Hamakawa et al.
patent: 5224002 (1993-06-01), Nakashima et al.
patent: 5606478 (1997-02-01), Chen et al.
patent: 5739991 (1998-04-01), Matono et al.
patent: 5831801 (1998-11-01), Shouji et al.
patent: 5864450 (1999-01-01), Chen et al.
patent: 5867890 (1999-02-01), Hsiao et al.
patent: 6033580 (2000-03-01), Shouji et al.
patent: 6243939 (2001-06-01), Chen et al.
patent: 2002/0089496 (2002-07-01), Numao
patent: 2002/0154443 (2002-10-01), Kawasaki et al.
patent: 2003/0179497 (2003-09-01), Harris et al.
patent: 2003/0179498 (2003-09-01), Hsiao et al.
patent: 2004/0252410 (2004-12-01), Hsu et al.
Schedule of “K2—Seventh International Symposium on Magnetic Materials, Processes and Devices” Oct. 20-25, 2002. www.electrochem.org/dl/ma/202/symposia/pik2.htm.
Bonhote, C.; Lam, J; Last, M. “Properties of DC plated 2.4 tesla CoFe alloys.” K2—Seventh International Symposium on Magnetic Materials, Processes and Devices. Oct. 20-25, 2002.
Bonhote, Christian; Cooper, Emanuel I.; Romankiw, Lubonyr T.; Xu, Hong. “Electroplated 2.4 Tesla CoFe films.” K2—Seventh International Symposium on Magnetic Materials, Processes and Devices. Oct. 20-25, 2002.
Flint Eric Wayne
Hsiao Wen-Chien (David)
Hsiao Yiping
Yang Michael Ming Hsiang
Berthold Thomas R.
Dravininkas Adam B
Klimowicz William
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