Patent ID: 6150046
Filing Date: 2000-11-21
Classification: G11B,H01F,Y10S,Y10T

Abstract:
A combination thin film magnetic head comprising:a magnetoresistive element layer;a main lead layer for supplying a sensing current to said magnetoresistive element layer;a lower core layer formed on the main lead layer with an insulation layer therebetween and having both a leading-side core function of an inductive head and an upper shielding function of a reading head;an upper core layer having an end opposed to the lower core layer with a magnetic gap therebetween in the portion opposite to a recording medium, with the other end magnetically connected to the lower core layer; anda coil layer for applying a magnetic field to both core layers;wherein said upper core layer is expressed by the composition formula Fe.sub.a M.sub.b O.sub.c wherein M is at least one element selected from Al, Si, Hf, Zr, Ti, V, Hb, Ta, W, Mg and the rare earth elements, wherein when said upper core layer is made of an Fe.sub.a M.sub.b O.sub.c alloy, in a ternary diagram of the Fe.sub.a M.sub.b O.sub.c alloy in which the composition ratios of element Fe, element M and element O are shown on the respective sides, the composition ratios a, b and c (atomic %) are in the range surrounded by the following ten points:A (Fe:M:O)=(52.5:12.5:35.0)B (Fe:M:O)=(53.3:11.1:35.6)C (Fe:M:O)=(57.5:9.0:33.5)D (Fe:M:O)=(63.3:4.8:31.9)E (Fe:M:O)=(75.3:4.0:20.7)F (Fe:M:O)=(76.3:5.0:18.7)G (Fe:M:O)=(75.0:6.7:18.3)H (Fe:M:O)=(70.0:9.0:21.0)I (Fe:M:O)=(57.4:13.0:29.6)J (Fe:M:O)=(53.5:13.0:33.5).