초록 ▼

A thin film magnetic head of which the insulation layer is made of a polyimide resin obtained by heat-curing a polyimide precursor represented by the following general formula (I) or (II) or a mixture thereof not only has excellent characteristics with respect to the insulation layer, i.e. satisfact

A thin film magnetic head of which the insulation layer is made of a polyimide resin obtained by heat-curing a polyimide precursor represented by the following general formula (I) or (II) or a mixture thereof not only has excellent characteristics with respect to the insulation layer, i.e. satisfactory flatness, high glass transition temperature and excellent adhesiveness but also is free from film defects, i.e., exhibits high reliability: [Figure] (I) [Figure] [Figure] (II) wherein R is, e.g., [Figure] Ar1 is, e.g., [Figure] Ar2 is, e.g. [Figure] n is an integer of 1 to 100, and m is an integer of 10 to 500.

대표청구항 ▼

A thin film magnetic head comprising a first magnetic layer, an insulating gap layer provided over said first magnetic layer, a first insulation layer provided over said insulating gap layer, a conductor layer provided over said first insulation layer, an insulation portion comprising at least one i

A thin film magnetic head comprising a first magnetic layer, an insulating gap layer provided over said first magnetic layer, a first insulation layer provided over said insulating gap layer, a conductor layer provided over said first insulation layer, an insulation portion comprising at least one insulation layer provided over said conductor layer and a second magnetic layer provided over said insulation portion, wherein at least an uppermost insulation layer of said insulation portion has a glass transition temperature of not less than 280°C. and is made of a product obtained by heat-curing a polyimide precursor represented by the following general formula (I) or a mixture of said polyimide precursor represented by the general formula (I) with a polyimide precursor represented by the following general formula (II): [Figure] (I) [Figure] [Figure] (II) wherein R is at least one radical selected from among [Figure] [Figure] [Figure] [Figure] [Figure] Ar1 is at least one radical selected from among [Figure] [Figure] [Figure] Ar2 is at least one radical selected from among [Figure] [Figure] [Figure] [Figure] n is an integer of 1 to 100; and m is an integer of 10 to 500. wherein said mixture has a mixing ratio in terms of weight ratio of solid content of the polyimide precursors represented by the following formula: [Figure] (III)