Patent ID: 7369359
Filing Date: 2008-05-06
Classification: G11B

Abstract:
1. A thin film magnetic head, comprising: a read head including a magnetoresistance effect element; and a write head layered on said read head, said write head having a lower magnetic pole at a base part of the write head and an upper magnetic pole at a top part of the write head, which sandwich a write gap layer, wherein a sectional shape of a write magnetic pole, which is constituted by the lower magnetic pole, the write gap layer and the upper magnetic pole, is formed into a trapezoid, in which the cross-sectional width of a top part of the upper magnetic pole is narrower than the cross-section width of a base part of the lower magnetic pole, and insulation layers, which are composed of a non-magnetic material are provided on both sides of the lower magnetic pole and cover grooves formed on both sides of the lower magnetic pole, and wherein only the insulation layers form the layers that are provided on both sides of the lower magnetic pole.