Magnetic head with thin trailing pedestal layer

Details Magnetic head with thin trailing pedestal layer Magnetic head with thin trailing pedestal layer

2007-11-06

2007-11-06

Watko, Julie Anne (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

Reexamination Certificate

active

10788766

ABSTRACT:
A magnetic head for a disk drive is disclosed that has a first soft magnetic pole layer disposed in the head adjacent to a medium-facing surface and extending perpendicular to the medium-facing surface; a second soft magnetic pole layer disposed closer than the first pole layer to the trailing end, the second pole layer magnetically coupled to the first pole layer in a backgap region; a soft magnetic pedestal adjoining the second pole layer, disposed closer than the second pole layer to the medium-facing surface and extending less than the second pole layer extends from the medium-facing surface, the pedestal separated from the first pole layer by a nonferromagnetic gap, the pedestal having a thickness that is less than four hundred and fifty nanometers between the gap and the second pole layer. Longitudinal and perpendicular recording embodiments are disclosed, as well as solenoidal, single-layer and dual-layer reversed-current coil structures.

REFERENCES:
patent: 6459543 (2002-10-01), Sasaki
patent: 6583954 (2003-06-01), Sasaki
patent: 6778354 (2004-08-01), Matono
patent: 2003/0179497 (2003-09-01), Harris et al.
patent: 2004/0037002 (2004-02-01), Kudo et al.
patent: 2004/0196590 (2004-10-01), Sasaki et al.
patent: 2005/0180048 (2005-08-01), MacDonald et al.
Honda et al, “1.5 Gbit/inΛ2 Perpendicular Recording with Inductive Head”, IEEE Transactions on Magnetics, v. 33, No. 5, pp. 3097-3099, Sep. 1997.

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