Chemistry: electrical and wave energy – Processes and products
Patent
1981-07-13
1984-03-13
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
29603, 156643, 156653, 156656, 156657, 1566591, 204192E, 427131, 427132, 430318, G11B 542
Patent
active
044365934
ABSTRACT:
A method is disclosed for precisely aligning the pole tips of a thin film magnetic head. Two separate metallic layers, such as Permalloy (Ni-Fe alloy) are separated by a layer of insulating material such as silicon dioxide or AL.sub.2 O.sub.3 which will serve as the insulative spacer of the final magnetic head. A photo-resist is applied to the surface of the top metallic layer in an imagewise configuration to establish the shape of the top pole. The top pole is then etched and the photo-resist removed. The top electrode is then encapsulated with a protective metal and is used as a mask during the chemical etching of the insulative layer, the bottom electrode being used as an etch stop. This integral structure is then used as a mask during the chemical etching of the bottom electrode, resulting in pole tips which are precisely aligned.
REFERENCES:
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patent: 4246620 (1981-01-01), Kaminaka et al.
W. D. Kehr et al., Magnetic Recording Head, IBM Tech. Disc. Bulletin, vol. 14, No. 7, Dec. 1971, pp. 2061-2062.
Bischoff Peter G.
Osborne John R.
Cass Nathan
Kaplan G. L.
Leader William
McCormack John J.
Memorex Corporation
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