Patent ID: 7274541

Claim:
A method of fabricating a magnetic thin film comprising the steps of: a) forming a write head element; b) forming a read head element; wherein a ferromagnetic film formed between said write head element and said read head element, having a soft magnetic characteristic and a magnetic shield function is provided in the vicinity of a sensor film arranged as said read head element, wherein said ferromagnetic film comprises NiFe material and is formed by an electroplating method, wherein the Ni composition of an initially formed layer of said ferromagnetic film has a thickness of 1.0 μm is 80.8 to 82.0 wt %, and wherein the Ni in composition of an upper layer above said initially formed layer of said ferromagnetic film is 81.0 to 81.2 wt %, c) timewise regulating a current density of the electroplating under control of a personal computer; wherein a Ni content accuracy is controlled to differ in a thickness direction of said ferromagnetic film to decrease a noise-after-write and an output fluctuation, d) wherein a plurality of time periods and a plurality of current values are preset for film formation.