Patent ID: 6459542
Filing Date: 2002-10-01
Classification: 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, and an insulation layer located between the lower and upper core layers and having a trench defining a track width Tw, all of which appear on a surface facing a recording medium, the upper and lower core layers being laminated with a gap layer provided therebetween and located in the trench;wherein a coil layer is formed directly on the insulation layer to be located at a back of the trench formed in the insulation layer in a depth direction, to induce a recording magnetic field in each of the upper and lower core layers; and a Gd (gap depth) setting insulation layer is provided on the insulation layer to extend in the depth direction from a back portion of the trench to a portion of the insulation layer surface where the trench and the coil layer is not formed, and the upper core layer is formed on the Gd setting insulation layer from the surface facing the recording medium such that the gap depth is determined by the recording medium-facing side end of the Gd setting insulation layer.