Patent ID: 6822832
Filing Date: 2004-11-23
Classification: G11B

Abstract:
A thin film magnetic head, comprising:a lower magnetic layer; a non-magnetic layer, laminated on the lower magnetic layer; a first upper magnetic layer, formed on the non-magnetic layer so as to form a magnetic core together with the lower magnetic layer and the non-magnetic layer, the first upper magnetic layer having a first saturation magnetic flux density and a first magnetostriction constant; an insulation layer, formed on the non-magnetic layer; a thin film coil, provided in the insulation layer; and a second upper magnetic layer, formed directly on the insulation layer so as to be at least above the thin film coil, the second upper magnetic layer having a second saturation magnetic flux density and a second magnetostriction constant, wherein the first saturation magnetic flux density is higher than the second saturation magnetic flux density, and the second magnetostriction constant is lower than the first magnetostriction constant; wherein the magnetic core has a head face which slides a magnetic recording medium; wherein a first end portion of the second upper magnetic layer is retracted from the head face; and wherein the first upper magnetic layer is extended from the first end portion of the second upper magnetic layer to the head face.