Patent ID: 7522387

Claim:
A thin film magnetic head, comprising: a sensor film; a mechanism to allow an electric current flow along the film thickness direction; an upper shield and a lower shield; a first insulating film provided at both ends in a track direction of said sensor film on an air bearing surface side with at least one part connected to a track direction wall surface of said sensor film; and a second insulating film formed between said upper shield and said first insulating film; wherein the relationship Tw<Dx<Bx holds in which Tw is a distance between edges of said first insulating film connected to said track direction wall surface of said sensor film, Bx is a distance between outside edges of said first insulating film along the track direction, and Dx is a distance between inside edges of said second insulating film along the track direction; wherein a pattern providing said Tw, a pattern providing a length along a depth direction from an air bearing surface of said sensor film, and a pattern providing a length along the depth direction from an air bearing surface of said second insulating film are additionally included; and a relationship Cy<Dy<Ty holds in which Ty is the length of the pattern providing said Tw along the depth direction from an air bearing surface, Cy is the length of the pattern along the depth direction providing the length of depth direction from an air bearing surface of said sensor film, and Dy is the length of the pattern along the depth direction from an air bearing surface providing the length of depth direction from an air bearing surface of said second insulating film.