Thin film magnetic head and method of manufacturing the same

摘要

A non-magnetic layer is laminated on a lower magnetic layer. A first upper magnetic layer is 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 has a first saturation magnetic flux density and a first magnetostriction constant. An insulation layer is formed on the non-magnetic layer. A thin film coil is provided in the insulation layer. A second upper magnetic layer is formed on the insulation layer so as to be at least above the thin film coil. The second upper magnetic layer has a second saturation magnetic flux density and a second magnetostriction constant. The first saturation magnetic flux density is higher than the second saturation magnetic flux density. The second magnetostriction constant is lower than the first magnetostriction constant.