Patent ID: 6809902
Filing Date: 2004-10-26
Classification: G11B

Abstract:
A thin film magnetic head comprising:a lower magnetic pole; an upper magnetic pole; an insulating layer being formed between said lower magnetic pole and said upper magnetic pole, said insulating layer having a apex part which is formed in the vicinity of a write-end of said thin film magnetic head and whose thickness is made thinner toward the write-end; a coil being formed in said insulating layer; and a gap layer being formed between the write-end of said lower magnetic pole and the write-end of said upper magnetic pole which are faced each other, wherein said insulating layer includes a first insulating layer, a second insulating layer and a third insulating layer, said coil is provided in a concave part formed in said lower magnetic pole;said concave part is filled with the first insulating layer, which insulates said coil from said lower magnetic pole, a high magnetic permeability layer, whose magnetic permeability is higher than that of said lower magnetic pole, is formed on a surface of said lower magnetic pole which faces said upper magnetic pole at the write-end, said gap layer is formed on said high magnetic permeability layer, the second insulating layer is formed on said first insulating layer so as to make up a level difference between said high magnetic permeability layer and the first insulating layer, and the third insulating layer is formed on the second insulating layer and has said apex part.