Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2002-09-05
2008-10-07
Castro, Angel (Department: 2653)
Dynamic magnetic information storage or retrieval
Head
Core
C428S692100
Reexamination Certificate
active
07433153
ABSTRACT:
The upper magnetic pole layer and/or lower magnetic pole layer comprises a soft magnetic film having a variable region in which the chemical composition of Fe changes in the direction of thickness in at least a part thereof, and the difference of the proportions of Fe between the regions most abundant in Fe and most deficient in Fe is 4% by mass or more in the variable region. The structure of the soft magnetic film permits the saturation magnetic flux density Bs to be improved while decreasing the coercive force Hc by forming fine crystal grains, thereby enabling a thin film magnetic head excellent in high density recording to be manufactured.
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Copy of Notification of Reasons of Refusal from corresponding Japanese patent application No. 2001-271140 (Sep. 21, 2004).
Kanada Yoshihiro
Yazawa Hisayuki
Brinks Hofer Gilson & Lione
Castro Angel
Magee Christopher R.
TDK Corporation
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