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US 2001/0043433 A1Published application
Thin-film magnetic head having magnetic gap formed of NiP
AssigneeAlps Electric Co., Ltd.
InventorsYoshihiro Kanada, Hisayuki Yazawa
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Abstract
A gap layer of a thin-film magnetic head is formed of NiP. The P content of the NiP gap layer is controlled to be within the range of 11 mass percent to 14 mass percent so that the gap layer is nonmagnetic.
Claims6
A thin-film magnetic head comprising:
- a lower core layer;
- a gap layer formed directly on the lower core layer or on a lower magnetic pole layer provided on the lower core layer;
- and
- an upper core layer formed directly on the gap layer or on an upper magnetic pole layer defining a track width provided on the gap layer;
- wherein the gap layer comprises NiP, the P content of the NiP being in the range of 11 mass percent to 14 mass percent.
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A method for making a thin-film magnetic head comprising a lower core layer comprising a magnetic material and an upper core layer comprising a magnetic material opposing the lower core layer provided with a gap layer therebetween, the method comprising the steps of:
- (a) forming the lower core layer by plating;
- (b) forming the gap layer directly on the lower core layer, or forming a lower magnetic pole layer on the lower core layer and then the gap layer on the lower magnetic pole layer by plating;
- and
- (c) forming the upper core layer directly on the gap layer or forming an upper magnetic pole layer on the gap layer and then the upper core layer on the upper magnetic pole layer by plating;
- wherein the gap layer is formed using NiP having a P content in the range of 11 mass percent to 14 mass percent.
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Dependencies are inferred from the claim text.