Pattern forming process and thin-film magnetic head formed by said process
First Claim
1. A pattern forming process which comprises forming a resist film on a substrate having a stepped surface by plasma polymerization, patterning said resist film, and removing that part of the substrate which is not covered with said resist film, thereby forming a pattern on said substrate.
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Abstract
Disclosed herein are a pattern forming process, particularly the one by lithography for fine fabrication, and a thin-film magnetic head formed by said process. The present invention provides a process for accurately fabricating a substrate having a stepped surface by dry etching, using as the mask a resist film formed by plasma polymerization. Plasma polymerization forms a uniform photosensitive resist film on a stepped surface, and the resist film can be used as the mask for the ion milling of the substrate.
68 Citations
24 Claims
- 1. A pattern forming process which comprises forming a resist film on a substrate having a stepped surface by plasma polymerization, patterning said resist film, and removing that part of the substrate which is not covered with said resist film, thereby forming a pattern on said substrate.
- 6. A pattern forming process which comprises forming a first resist film on a substrate having a stepped surface, forming a second resist film on said first resist film by plasma polymerization, patterning said second resist film, patterning said first resist film using said patterned second resist film as a mask, and removing that part of the substrate which is not covered with said first and second resist films.
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15. An improved process for producing a thin-film magnetic head including the steps of forming a first magnetic layer, a gap layer of non-magnetic material, a coil, and a second magnetic layer on a non-magnetic substrate by thin-film technology, wherein said improvement comprises forming a resist film on said second magnetic layer by plasma polymerization, patterning said resist film, and removing the part of the second magnetic film which is not covered with the resist film, thereby fabricating the second magnetic layer which determines the track width for recording and reading.
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17. An improved process for producing a thin-film magnetic head including the steps of forming a first magnetic layer, a gap layer of non-magnetic material, a coil, and a second magnetic layer on a non-magnetic substrate by thin-film technology, wherein said improvement comprises forming a first resist film on said second magnetic layer, forming a second resist film on said first resist film by plasma polymerization, patterning said second resist film, patterning said first resist film using said second resist film as a mask, and removing the part which is not covered with said first and second resist films, thereby fabricating the second magnetic layer which determines the track width for recording and reading.
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20. A thin-film magnetic head comprising a first magnetic layer on a non-magnetic substrate, a gap layer of non-magnetic material, a coil, a second magnetic layer, and a protective layer on said second magnetic layer wherein said protective layer is used as a resist film, being formed by plasma polymerization, being patterned, and a part of the second magnetic layer which is not covered with said resist film, is removed thereby fabricating the second magnetic layer which determines the track width for recording and reading.
- 21. A thin-film magnetic head comprising a first magnetic layer on a non-magnetic substrate, a gap layer of non-magnetic material, a coil, a second magnetic layer, and a protective layer on said second magnetic layer, wherein said protective layer is used as a first resist film, being patterned by using a second resist film formed on said first resist film by plasma polymerization as a mask, and said a part of the second magnetic layer which is not covered with said first and second resist film is removed, thereby fabricating the second magnetic layer which determines the track width for recording and reading.
Specification