Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2011-05-03
2011-05-03
Kim, Paul D (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603130, C029S603140, C029S603150, C029S603180, C216S022000, C216S039000, C216S041000, C216S048000, C216S065000, C360S121000, C360S122000, C360S317000, C451S005000, C451S041000
Reexamination Certificate
active
07934310
ABSTRACT:
Prior art designs of single pole writers have been limited by premature saturation at the tip. This limits the head field that can be achieved without simultaneously widening the write profile. This problem has bee solved by means of a vertical main pole whose thickness has its conventional value a short distance from the tip but that tapers down to a significantly reduced value as it approaches the tip. A process for manufacturing this tapered tip design is also presented.
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“Perpendicular recording: the promise and the problems,” by Roger Wood et al., Journal of Magnetism and Magnetic Materials 235, (2001) 1-9, NH Elsevier.
“Design Considerations for Single-Pole-Type Write Heads,” by Joshua Schare et al., IEEE Transactions on Magnetics, vol. 39, No. 3, May 2003, pp. 1842-1845.
“Micromagnetics of perpendicular write heads with extremely small pole tip dimensions,” by Daniel Z. Bai et al., Journal of Applied Physics, vol. 91, No. 10, May 15, 2002, pp. 6833-6835.
Guan Lijie
Hu Hung Liang
Tang Yaw Shing
Ackerman Stephen B.
Headway Technologies Inc.
Kim Paul D
Saile Ackerman LLC
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