Dual gap horizontal thin film inductive head

Details Dual gap horizontal thin film inductive head Dual gap horizontal thin film inductive head

1996-03-15

1999-07-20

Cao, Allen T.

Dynamic magnetic information storage or retrieval

Head

Plural gaps

360126, G11B 529, G11B 5147

Patent

active

059263504

ABSTRACT:
A dual gap horizontal thin film inductive head is provided which writes wide and reads narrow so as to avoid noise problems when reading an information track on a magnetic medium. The head has first and second gap layers between first and second horizontal pole tips. The pole tips and the corresponding pole pieces of the head are constructed of a high magnetic moment material, such as NiFe (Permalloy). The first gap layer is constructed of a magnetic insulator, such as tungsten, and the second gap layer is constructed of a low magnetic moment material, such as NiFeCr. Accordingly, the magnetic moment of the second gap layer is lower than the magnetic moment of the first and second pole tips and the corresponding first and second pole pieces. During recording both gap layers function as a gap because the second gap layer is saturated and behaves as a magnetic insulator. During playback only the first gap layer functions a gap because the second gap layer is not saturated causing it to behave as a magnetic conductor. Accordingly, during record the head "writes wide" and during playback the head "reads narrow." A unique method is provided for making the head which employs a vertical edge of a photoresist layer for forming the first and second gap layers.

REFERENCES:
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patent: 5435053 (1995-07-01), Krounbi et al.
patent: 5606478 (1997-02-01), Chen et al.

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