Patent ID: 6515824
Filing Date: 2003-02-04
Classification: B82Y,G11B

Abstract:
A thin film magnetic head comprising a lower core layer made of a magnetic material, an upper core layer made of a magnetic material, a gap layer to magnetically insulate the lower core layer from the upper core layer, and an insulating layer located between the lower core layer and the upper core layer, all of which are exposed in a surface facing a recording medium;wherein a trench is formed in the insulating layer, the trench extending from the surface of the insulating layer to the lower core layer, and further extends from the surface facing the recording medium in a height direction; the trench comprises a track-width region which defines a track width from a top of the lower core layer to a predetermined height, and an inclined region having inclined surfaces such that a width dimension of the trench gradually increases from an upper edge of the track-width region to the surface of the insulating layer; the gap layer is located in the track-width region, and a portion of the upper core layer is formed to extend from the inclined surfaces formed in the trench in a direction away from the lower core layer; and the upper core layer is limited in a width direction to a region between extensions in a direction perpendicular to a planar direction of the lower core layer of upper ends of the inclined surfaces of the inclined region.