Method of making a thin film head with contoured pole face edges

Details Method of making a thin film head with contoured pole face edges Method of making a thin film head with contoured pole face edges

1991-05-20

1992-08-11

Hall, Carl E.

Coating processes

Electrical product produced

Coil or winding

29603, 360119, 360125, 427131, G11B 542, B05D 512

Patent

active

051377500

ABSTRACT:
A thin film magnetic read/write head is manufactured using Al.sub.2 O.sub.3 dams. The Al.sub.2 O.sub.3 dams are formed using a sacrificial layer which is deposited upon a bottom pole layer. An Al.sub.2 O.sub.3 layer is deposited over the sacrificial layer. When the sacrificial layer is removed, the Al.sub.2 O.sub.3 layer forms dams between which a top pole piece is deposited. The sacrificial layer is removed using lapping and a selected chemical etch; partial lapping or chemical etch followed by chemical etch of the sacrificial layer which lifts-off overlying Al.sub.2 O.sub.3 ; depositing photoresist dams and chemically etching the encapsulation layer and the sacrificial layer; or removal through physical or thermal shock of the Al.sub.2 O.sub.3 layer sputtered at zero bias followed by a selective chemical etch of the sacrificial layer. The thin film magnetic head of the present invention has pole tips which provide an outside pole face contour that is significantly different from a pole tip contour along a gap region. This reduces an undershoot effect in readback pulses in a readback signal. The altered contour can be used on both top and bottom pole tips to eliminate both leading and trailing undershoots. Additionally, in shielded probe heads for vertical recording a gap region contour can be altered to achieve a similar reduction in leading undershoot.

REFERENCES:
patent: 4839197 (1989-06-01), Henderson
patent: 4947541 (1990-08-01), Toyoda et al.
patent: 4949207 (1990-08-01), Lazzari
patent: 4970615 (1990-11-01), Gau
patent: 4970616 (1990-11-01), Ramaswamy
patent: 4992901 (1991-02-01), Keel et al.
Yamaha Corporation, Japan, Yamaha Thin Film Head, Sep. 1989.

Affiliated with

Also associated with

Rating

Method of making a thin film head with contoured pole face edges does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making a thin film head with contoured pole face edges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making a thin film head with contoured pole face edges will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-345358