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US 5,702,756 AGranted
Process for making a thin film magnetic head
AssigneeInternational Business Machines Corporation
InventorsDennis Richard McKean, Alfred Floyd Renaldo
Life of this patent
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Abstract
An improved process for making thin film magnetic heads using an insulation comprising a polymer, a crosslinking agent, and 4-sulfonate diazonaphthoquinone.
Claims11
A method for making a thin film magnetic head comprising the steps of:
- (a) forming a first pole piece layer of magnetic material;
- (b) depositing a gap-forming layer of nonmagnetic material over said first pole piece layer;
- (c) depositing a first layer of insulation material on the gap-forming layer;
- (d) forming a conductive coil on said first layer of insulating material;
- (e) depositing a second layer of insulation material over said conductive coil, the first and second layers of insulation material comprising a phenolic resin polymer, 4-sulfonate diazonaphthoquinone, and less than 20 weight % of a thermally activated melamine formaldehyde resin crosslinking agent;
- (f) heating the first and second layers of insulating material to crosslink the polymer;
- and
- (g) depositing a second pole piece layer of magnetic material to complete the magnetic head.
5 more elements
A method for making a thin film magnetic write head of a magnetoresistive read/write head comprising the steps of:
- (a) forming a first pole piece layer of magnetic material;
- (b) depositing a gap-forming layer of nonmagnetic material over said first pole piece layer;
- (c) depositing a first layer of insulation material on the gap-forming layer;
- (d) forming a conductive coil on said first layer of insulating material;
- (e) depositing a second layer of insulation material over said conductive coil, the first and second layers of insulation material comprising a phenolic resin polymer, 4-sulfonate diazonaphthoquinone, and less than about 20 weight % of a thermally activated melamine formaldehyde resin crosslinking agent;
- (f) heating the first and second layers of insulating material to a temperature less than 200.degree. C. to crosslink the polymer;
- and
- (g) depositing a second layer of magnetic material to complete the thin film magnetic write head.
5 more elements
A method for making a thin film magnetic head comprising the steps of:
- (a) forming a first pole piece layer of magnetic material;
- (b) depositing a gap-forming layer of nonmagnetic material over said first pole piece layer;
- (c) depositing a first layer of insulation material on the gap-forming layer;
- (d) forming a conductive coil on said first layer of insulating material;
- (e) depositing a second layer of insulation material over said conductive coil, the first and second layers of insulation material comprising a phenolic resin polymer, 4-sulfonate diazonaphthoquinone, and less than 20 weight % of a thermally activated glycol urea crosslinking agent;
- (f) heating the first and second layers of insulating material to crosslink the polymer;
- and
- (g) depositing a second pole piece layer of magnetic material to complete the magnetic head.
5 more elements
Dependencies are inferred from the claim text.