Magnetic head for perpendicular magnetic recording and...

Details Magnetic head for perpendicular magnetic recording and... Magnetic head for perpendicular magnetic recording and...

2009-10-15

2011-12-06

Cao, Allen (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

Reexamination Certificate

active

08072706

ABSTRACT:
A main magnetic pole includes a first part extending from a medium facing surface to a point at a predetermined distance from the medium facing surface, and a second part other than the first part. An accommodation part for accommodating the main magnetic pole includes: a first layer having a groove; a second layer lying between the first layer and the main magnetic pole in the first layer's groove; and a third layer interposed in part between the second layer and the main magnetic pole in the first layer's groove. The second layer is formed of a metal material different from a material used to form the first layer. The third layer is formed of an inorganic insulating material. The second and third layers lie between the first layer and the first part. The second layer lies between the bottom of the first layer's groove and the second part, but the third layer does not. The distance between the bottom of the first layer's groove and the second part is smaller than that between the bottom and the first part.

REFERENCES:
patent: 4858048 (1989-08-01), Hayakawa et al.
patent: 2008/0239567 (2008-10-01), Sasaki et al.
patent: 2009/0002884 (2009-01-01), Sasaki et al.
patent: 2011/0086182 (2011-04-01), Matono et al.

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