Patent ID: 6204997
Filing Date: 2001-03-20
Classification: G11B

Abstract:
A thin-film magnetic heads including:at least two magnetic layers including two magnetic poles magnetically coupled to each other, part of sides of the magnetic poles facing a recording medium being opposed to each other with a gap layer in between; anda thin-film coil unit placed between the at least two magnetic layers, the thin-film coil unit including:a helical-shaped first thin-film coil;an insulating film covering at least a bottom and sides of a helical groove which is a region between turns of the first thin-film coil, the insulating film extending to a top surface of the first thin-film coil; anda second thin-film coil, having a T-shaped cross-section, being at least partially positioned inside the helical groove covered with the insulating film so as to directly come to contact with the insulating film, and further being at least partially positioned so that a portion of the second thin-film coil covers at least part of the top surface of the first thin-film coil with the insulating film, in between.