Magnetic head for perpendicular magnetic recording with a...

Details Magnetic head for perpendicular magnetic recording with a... Magnetic head for perpendicular magnetic recording with a...

2011-05-24

2011-05-24

Davis, David D (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07948716

ABSTRACT:
A magnetic head includes: a coil; a pole layer; a shield having an end face located in a medium facing surface forward of an end face of the pole layer along a direction of travel of a recording medium; a gap layer between the shield and the pole layer; and a substrate on which the foregoing elements are stacked. The top surface of the pole layer includes: first and second portions with a difference in height therebetween; and a third portion connecting the first and second portions to each other. The first portion has an edge located in the medium facing surface, and the second portion is located farther from the medium facing surface and from the substrate than the first portion. The magnetic head further includes a nonmagnetic layer disposed between the second portion and the gap layer. The nonmagnetic layer has a surface touching the second portion, the surface having an edge located at the boundary between the second and third portions. The nonmagnetic layer has a thickness equal to or greater than the difference in height between the first and second portions.

REFERENCES:
patent: 7212379 (2007-05-01), Hsu et al.
patent: 2005/0219747 (2005-10-01), Hsu et al.
patent: 2007/0067982 (2007-03-01), Kobayashi
patent: A-2005-108293 (2005-04-01), None
patent: A-2005-293822 (2005-10-01), None

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