Low fringe-field and narrow write-track magneto-resistive (MR) m

Details Low fringe-field and narrow write-track magneto-resistive (MR) m Low fringe-field and narrow write-track magneto-resistive (MR) m

1996-07-17

1998-02-17

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

360122, G11B 5127, G11B 5187

Patent

active

057197300

ABSTRACT:
A low fringe-field and narrow write-track magnetic read-write head. The low fringe-field and narrow write-track magnetic read-write head includes a first pole layer formed adjoining an insulator layer over a substrate. The first pole layer has a first air bearing surface which has a first edge adjoining and parallel with a first surface of the insulator layer. The low fringe-field and narrow write-track magnetic read-write head also includes a second pole layer separated from the first pole layer by the insulator layer. The second pole layer has a width no greater than about 20 microns and a width no greater than about 100 percent of the width of the first pole layer where the width of the second pole layer is contained within the width of the first pole layer. The second pole layer also has a second air bearing surface coplanar with the first air bearing surface. The second air bearing surface has a second edge adjoining and parallel with a second surface of the insulator layer parallel and opposite from the first surface of the insulator layer. Finally, there is removed at least one portion of at least one of: (1) the second air bearing surface including at least one outer portion of the second edge; and (2) the first air bearing surface including at least one portion of the first edge most closely adjoining but not opposite the second edge.

REFERENCES:
patent: 5075956 (1991-12-01), Das
patent: 5193039 (1993-03-01), Smith et al.
patent: 5229904 (1993-07-01), Iyo et al.
patent: 5452164 (1995-09-01), Cole et al.
patent: 5479696 (1996-01-01), McNeil
patent: 5495378 (1996-02-01), Bonyhard et al.
patent: 5532892 (1996-07-01), Nix et al.

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