Soft magnetic films for head core materials mainly electrodeposited CoNiFe
based films developed by us were introduced. Electrodeposited CoNiFe thin f
ilm has high saturation magnetic flux density (B-s) and low coercivity. Mag
netic properties except for B-s and corrosion properties of these films wer
e depended on very small amount of inclusion such as S and H elements. The
increase in resistivity (rho) on the base of this high B-s CoNiFe thin film
was developed by controlling very small amount of C inclusion. Finally, ap
plication of the film to new type of magnetic recording head was reported.