Patent ID: 7158344
Filing Date: 2007-01-02
Classification: B82Y,G11B

Abstract:
1. A thin-film magnetic head comprising: a lower core layer which is formed such that the lower core layer extends in a height direction from a surface opposing a recording medium and on which a protuberant layer formed over a predetermined length in the height direction from the surface opposing the recording medium and a back gap layer formed in the height direction such that the back gap layer is away from a rear end surface of the protuberant layer by a predetermined distance in the height direction are deposited; a magnetic pole layer that connects the protuberant layer and the back gap layer, a track width Tw thereof being determined by a width dimension in the direction of track width at the surface opposing the recording medium; and a coil layer helically encompassing the magnetic pole layer, wherein a plurality of first coil segments extending in directions in which the first coil segments cross the magnetic pole layer is formed in the height direction with intervals provided thereamong in a space encompassed by the lower core layer, the protuberant layer, and the back gap layer, a coil insulating layer being provided among the first coil segments, an upper surface of the protuberant layer, upper surfaces of the first coil segments, and an upper surface of the back gap layer form a continuous planarized surface, a Gd-determining layer composed of an insulating material is formed to cover the upper surfaces of the first coil segments from a position apart in the height direction by a predetermined distance from the surface opposing a recording medium, the magnetic pole layer having a gap layer provided on the protuberant layer positioned closer to the surface opposing the recording medium than the Gd-determining layer is, and an upper magnetic pole layer deposited, beginning from the upper surface of the gap layer through the Gd-determining layer onto the back gap layer, and a plurality of second coil segments across the upper surface of the magnetic pole layer through the intermediary of the insulating layer is deposited on the magnetic pole layer with intervals provided thereamong in the height direction, and ends of adjacent ones of the first coil segments are connected through the intermediary of the second coil segments so as to form the helically wound coil layer.