Patent ID: 7589937

Claim:
A thin film magnetic head, comprising: a lower magnetic pole having a magnetic core, wherein at least a portion of the magnetic core of the lower magnetic pole is made of an Fe-Ni-Co series alloy plating film with addition of a nonmagnetic metal Cr or at least one of Pd, Rh, Ru, Re, Mo and Ir, and wherein a film composition of the Fe-Ni-Co series alloy plating film comprises about 84-92 wt % Fe, about 1 to 3 wt % Co, and about 0.5 to 1.5 wt % nonmagnetic metal, wherein the Fe-Ni-Co series alloy plating film has a heat treatment in the magnetic field after plating, wherein an Hc of the film composition of the Fe-Ni-Co series alloy plating film is 1.5 Oe or less.