Dynamic magnetic information storage or retrieval – Head – Head surface structure
Reexamination Certificate
2009-03-16
2010-12-28
Miller, Brian E (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Head surface structure
C360S125150
Reexamination Certificate
active
07859790
ABSTRACT:
A write pole tip for a magnetic head has a trailing edge that is closer than a leading edge to a perpendicular recording medium, so that the write signal strength of the trailing edge is greater than that of the leading edge. Such an angled pole tip can write a sharp magnetic pattern with the trailing edge, reducing erroneous writing. A layer of physically hard material such as diamond-like carbon (DLC) may adjoin the trailing edge, the physically hard material layer protruding slightly after polishing of the media-facing surface due to its resistance to lapping. This can form an acute corner of the write pole tip adjacent to the physically hard material layer. The trailing edge may be longer than the leading edge, and the write pole tip may have a trapezoidal shape.
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Lauer Mark A.
Miller Brian E
Silicon Edge Law Group LLP
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