Patent ID: 7227719

Claim:
A thin film magnetic head comprising: a substrate; a first magnetic material film made of a magnetic material and extending inwardly from an air bearing surface to have a flat surface, said first magnetic material film constitutes a bottom pole; a second magnetic material film formed on said flat surface of the first magnetic material film opposite to the substrate, said second magnetic material film extending inwardly from the air bearing surface beyond a throat height zero reference position and constituting a part of a bottom track pole; a thin film coil formed on said flat surface of the first magnetic material film such that a surface of the thin film coil opposite to the first magnetic material film forms a coplanar flat surface together with a surface of said second magnetic material film, said thin film coil including a plurality of coil windings which are insulated and isolated from said first magnetic material film and are mutually insulated and isolated; an insulating film formed on said coplanar flat surface of the thin film coil and second magnetic material film to extend up to the throat height zero reference position such that the thin film coil and a part of the second magnetic material film are covered with said insulating film; a third magnetic material film formed on a remaining portion of said second magnetic material film which is not covered with said insulating film to constitute a part of the bottom track pole such that a surface of the third magnetic material film opposite to the second magnetic material film forms a coplanar flat surface together with a surface of said insulating film opposite to said thin film coil; a write gap film made of a non-magnetic material and formed on said coplanar flat surface of said insulating film and third magnetic material film to have a flat surface; and a fourth magnetic material film formed on a surface of said write gap film opposite to the third magnetic material film and insulating film and constituting a top pole including a top track pole aligned with the bottom track pole formed by said second and third magnetic material films.