Patent ID: 6724570
Filing Date: 2004-04-20
Classification: G11B

Abstract:
A thin film magnetic head including: two magnetic layers magnetically coupled to each other and having two magnetic poles which face each other with a gap layer in between near and in a recording-medium-facing surface to be faced with a recording medium, a thin film coil provided between the two magnetic layers, and an insulating layer for insulating the thin film coil from one of the two magnetic layers having a first magnetic layer portion and a second magnetic layer portion, the first magnetic layer portion having a uniform-width portion extending away from a recording-medium-facing surface facing a recording medium and defining a write track width on the recording medium, and the second magnetic layer portion coating a region in which the thin film coil is provided and partly overlapping and magnetically coupled to a part of the first magnetic layer portion,wherein a distance LD (&mgr;m) between a position of an edge of the second magnetic layer portion closest to the recording-medium-facing surface and a position of the recording-medium-facing surface and a thickness LT (&mgr;m) of a portion of the first magnetic layer portion exposed to the recording-medium-facing surface satisfy LD&gE;LT.