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US 2001/0026419 A1Published application
Thin film magnetic head for reducing side-fringing
AssigneeAlps Electric Co., Ltd.
InventorsToshinori Watanabe, Hisayuki Yazawa
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Abstract
The leak magnetic field generated from the upper core layer toward the upper magnetic pole layer can concentrate in the vicinity of the gap layer to suppress side-fringing from generating while increasing the overwrite, by making the saturation magnetic flux density Bs1 of the upper magnetic pole layer to be higher than the saturation magnetic flux density Bs2 of the upper core layer, and by directly bonding the upper core layer on the upper magnetic pole layer.
Claims6
A thin film magnetic head comprising:
- a lower core layer;
- a recording core comprising a lower magnetic pole layer, a gap layer and an upper magnetic pole layer, or a gap layer and an upper magnetic pole layer, sequentially laminated on the lower core layer, and exposed on a surface facing a recording medium;
- an upper core layer formed on the recording core;
- and
- a coil for inducing a recording magnetic field on the lower core layer, recording core and upper core layer,
- wherein the upper magnetic pole layer is formed of a magnetic material having a higher saturation magnetic flux density than the upper core layer, and the upper core layer is directly bonded to the upper magnetic pole layer.
3 more elements
Dependencies are inferred from the claim text.