Dual gap magnetic head and method of making the same

Details Dual gap magnetic head and method of making the same Dual gap magnetic head and method of making the same

1996-05-15

1998-03-31

Cao, Allen

Dynamic magnetic information storage or retrieval

Head

Gap spacer

360126, G11B 523, G11B 5147

Patent

active

057345333

ABSTRACT:
An air bearing magnetic head is formed with a dual gap for minimizing side fringe fields, side reading, side writing, cross-talk interference, and pulse asymmetry, while maintaining the efficiency of the head. The method of manufacturing the head enables the control of the effective track width with great precision. The head is made by depositing a layer of magnetic material that defines a first pole P1. A dual gap is formed on the first pole P1 by depositing a first layer of nonmagnetic material that defines two side gaps and part of a central gap interposed between the two side gaps. A second layer of nonmagnetic material is deposited on the first layer in order to further define the central gap. In its final configuration, the central gap is substantially wider than the two side gaps. Another layer of magnetic material is deposited over the central and side gaps for defining a second pole P2. The outer edges of the dual gap and the two poles P1, P2 are trimmed such that sections of the side gaps are gradually recessed relative to the air bearing surface of the magnetic head.

REFERENCES:
patent: 4405959 (1983-09-01), Chabrolle
patent: 4742412 (1988-05-01), Kuriyama
patent: 4908724 (1990-03-01), Jeffers
patent: 5212611 (1993-05-01), Dee
patent: 5267112 (1993-11-01), Batra et al.
patent: 5428491 (1995-06-01), Smith
patent: 5483403 (1996-01-01), Voegeli

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