Patent ID: 6999276

Claim:
A magnetic head comprising: a lower core layer; an upper core layer; a coil layer to apply 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 a track width direction smaller than that of the lower core layer and the upper core layer, the magnetic pole one of 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, and comprising the upper magnetic pole layer adjoining the upper core layer and the 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 a difference between a maximum Fe content and a minimum Fe content of the at least one of the upper magnetic pole layer and the lower magnetic pole layer within 0.3 μm from an interface with the gap layer is at most 6 mass %, and the Fe content in a cross section of the at least one of the upper magnetic pole layer and the lower magnetic pole layer increases towards an interface with the gap layer.