Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2011-01-18
2011-01-18
Castro, Angel A. (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
07872835
ABSTRACT:
Improved writability and a reduction in adjacent track erasure are achieved in a PMR writer with a large flare angle of 45 and 90 degrees in the main write pole and a full side shield or partial side shield configuration around the narrow write pole section and write pole tip. A trailing shield is formed above the write pole's top surface and a full or partial side shield section is spaced a certain distance from each side of the write pole. The partial side shield has a thickness less than that of the write pole and a top or bottom surface about coplanar with the pole tip's top or bottom edge, respectively. The partial side shield may include two sections on each side of the write pole wherein the bottom surface of a top section is separated by a certain distance from the top surface of a bottom section.
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Co-pending U.S. Appl. No. 11/809,346, filed Mar. 31, 2007, “A Method to Make a Perpendicular Magnetic Recording Head with a Bottom Side Shield”, assigned to the same assignee as the present invention.
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Ackerman Stephen B.
Castro Angel A.
Headway Technologies Inc.
Saile Ackerman LLC
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