Magnetic head with precisely defined zero throat height

Details Magnetic head with precisely defined zero throat height Magnetic head with precisely defined zero throat height

1998-08-21

2000-10-17

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Core

G11B 531

Patent

active

061340804

ABSTRACT:
A strip of baked photoresist is employed for defining the zero throat height (ZTH) of a write head portion of a merged head. The zero throat height is the location where first and second pole pieces of the write head first commence to separate after an air bearing surface (ABS) of the write head for reducing flux leakage therebetween. A read head portion of the merged head includes a read sensor that has a recessed edge. The recessed edge defines a stripe height of the read head. The stripe height, which is the distance between the ABS and the recessed edge, establishes the magnetics of the read head. The present invention more accurately positions the ZTH with improved predictability relative to the stripe height since there is minimal shrinkage of the photoresist strip during a baking step. Further the photoresist strip has a desirable apex angle at its front ZTH defining edge for minimizing flux leakage between the pole pieces.

REFERENCES:
patent: 5652687 (1997-07-01), Chen et al.
patent: 5805391 (1998-09-01), Chang et al.

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