Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2007-02-20
2007-02-20
Davis, David (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Core
Reexamination Certificate
active
10405244
ABSTRACT:
Provided is a thin film magnetic head capable of reducing expansion and bending of a recording pattern resulting from a skew so as to improve recording performance. A main pole layer comprises a laminate including a bottom main pole layer being disposed on a medium-incoming side and having a first saturated magnetic flux density and a top main pole layer being disposed on a medium-outgoing side and having a second saturated magnetic flux density larger than the first saturated magnetic flux density. When magnetic flux flows in the main pole layer, magnetic flux saturation occurs in the bottom main pole layer with a smaller saturated magnetic flux density, however, no magnetic flux saturation occurs in the top main pole layer with a larger saturated magnetic flux density, so the magnetic flux flows mainly in the top main pole layer on a priority basis. Writing by the main pole layer is mainly performed by the top main pole layer on the medium-outgoing side, so compared with the case where the main pole layer has a large saturated magnetic flux density as a whole, expansion of the recording pattern resulting from the skew can be reduced.
REFERENCES:
patent: 4078300 (1978-03-01), Lazzari
patent: 4639810 (1987-01-01), Sakai
patent: 4768121 (1988-08-01), Nakashima et al.
patent: 4803582 (1989-02-01), Sakai
patent: 4858048 (1989-08-01), Hayakawa et al.
patent: 4873599 (1989-10-01), Sueoka
patent: 5073836 (1991-12-01), Gill et al.
patent: 5157570 (1992-10-01), Shukovsky et al.
patent: 5225953 (1993-07-01), Wada et al.
patent: 5606478 (1997-02-01), Chen et al.
patent: 5668689 (1997-09-01), Schultz et al.
patent: 5995341 (1999-11-01), Tanaka et al.
patent: 6101068 (2000-08-01), Ohtomo et al.
patent: 6163442 (2000-12-01), Gill et al.
patent: 6259583 (2001-07-01), Fontana et al.
patent: 6504675 (2003-01-01), Shukh et al.
patent: 6721131 (2004-04-01), Litvinov et al.
patent: 6791796 (2004-09-01), Shukh et al.
patent: 6813115 (2004-11-01), Van der Heijden et al.
Matono Naoto
Shoji Shigeru
Takano Ken-ichi
Davis David
Oliff & Berridg,e PLC
SAE Magnetics (H.K. ) Ltd.
TDK Corporation
LandOfFree
Thin film magnetic head capable of reducing expansion and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thin film magnetic head capable of reducing expansion and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thin film magnetic head capable of reducing expansion and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3813871