Thin film magnetic head and method of manufacturing the same

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 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.