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US 2002/0163759 A1Published application
Writing magnetic head having increased saturation magnetic flux density in vicinity of gap layer
AssigneeAlps Electric Co., Ltd.
InventorsYoshihiro Kanada, Hisayuki Yazawa
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Abstract
A magnetic head includes an upper magnetic pole layer formed by electroplating in which the density of the impressed current is increased in stages every predetermined period of time. The upper magnetic pole layer contains at least 60 mass % of Fe. The difference between the maximum Fe content and the minimum Fe content of the upper magnetic pole layer within 0.3 μm from the interface with the gap layer is 6 mass % or less.
Claims12
A magnetic head comprising:
- a lower core layer;
- an upper core layer;
- a coil layer for applying a writing magnetic field to the lower core layer and the upper core layer;
- and
- a magnetic pole disposed between the lower core layer and the upper core layer, the magnetic pole having a width in the track width direction smaller than that of the lower core layer and the upper core layer, the magnetic pole comprising a lower magnetic pole layer adjoining the lower core layer, an upper magnetic pole layer adjoining the upper core layer, and a gap layer disposed between the lower magnetic pole layer and the upper magnetic pole layer, or comprising an upper magnetic pole layer adjoining the upper core layer and a gap layer disposed between the upper magnetic pole layer and the lower core layer;
- wherein at least one of the upper magnetic pole layer and the lower magnetic pole layer comprises a soft magnetic material comprising at least 60 mass % of Fe, and the difference between the maximum Fe content and the minimum Fe content of said at least one of the upper magnetic pole layer and the lower magnetic pole layer within 0.3 μm from the interface with the gap layer is 6 mass % or less.
3 more elements
A magnetic head comprising:
- a lower core layer;
- an upper core layer;
- a coil layer for applying a writing magnetic field to the lower core layer and the upper core layer;
- and
- a magnetic pole disposed between the lower core layer and the upper core layer, the magnetic pole having a width in the track width direction smaller than that of the lower core layer and the upper core layer, the magnetic pole comprising a lower magnetic pole layer adjoining the lower core layer, an upper magnetic pole layer adjoining the upper core layer, and a gap layer disposed between the lower magnetic pole layer and the upper magnetic pole layer, or comprising an upper magnetic pole layer adjoining the upper core layer and a gap layer disposed between the upper magnetic pole layer and the lower core layer;
- wherein the upper magnetic pole layer comprises at least a first magnetic sub layer adjoining the gap layer and a second magnetic sub layer, and the first magnetic sub layer comprises a soft magnetic material comprising at least 60 mass % of Fe, and
- wherein the difference between the maximum Fe content and the minimum Fe content of the first magnetic sub layer within 0.3 μm from the interface with the gap layer is 6 mass % or less.
4 more elements
Dependencies are inferred from the claim text.