Perpendicular magnetic recording head having a main magnetic...

Details Perpendicular magnetic recording head having a main magnetic... Perpendicular magnetic recording head having a main magnetic...

2007-04-05

2010-12-28

Heinz, A. J. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

C360S125090, C360S125100

Reexamination Certificate

active

07859791

ABSTRACT:
A perpendicular magnetic recording head includes a nonmagnetic insulating layer and a main magnetic pole layer disposed on the nonmagnetic insulating layer. The main magnetic pole layer includes a pole straight part exposed in an opposing surface opposite a recording medium and a flared part that extends from the pole straight part in a height direction. The flared part broadens in a track width direction as the flared part extends in the height direction. The pole straight part of the main magnetic pole layer as viewed from the opposing surface has a trapezoidal shape over its entire length, the trapezoidal shape being narrowed at the nonmagnetic insulating layer-side. The flared part as viewed from the opposing surface has a trapezoidal shape at least at a junction with the pole straight part, the trapezoidal shape being narrowed at the nonmagnetic insulating layer-side.

REFERENCES:
patent: 6952325 (2005-10-01), Sato et al.
patent: 7535675 (2009-05-01), Kimura et al.
patent: 2003/0021063 (2003-01-01), Kuroda et al.
patent: 2002-197611 (2002-07-01), None
patent: 2003-203311 (2003-07-01), None
patent: 2006-018985 (2006-01-01), None
Office Action issued in corresponding Japanese Patent Application No. 2006-106558; issued May 7, 2008.

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