Soft magnetic thin film, method for preparing same and magnetic head

A thin film magnetic head comprising:

• a substrate,
• a lower soft magnetic layer, an insulating layer, a coil conductor layer and an upper soft magnetic layer which are provided in this order on the substrate, and
• a magnetic gap layer which extends to a surface of the magnetic head directed to the recording medium, and which is provided between the lower soft magnetic layer and the upper soft magnetic layer,
• wherein each of the soft magnetic layers is represented by the formula Fe.sub.a B.sub.b N.sub.c, where a, b and c each denote the compositional ratios in atomic percent, and B denotes at least one selected from the group consisting of Zr, Hf, Ti, Nb, Ta, V, Mo and W and the composition range is such that
• 0<b.ltoreq.20 and
• 0<c.ltoreq.22
• with the exclusion of the range defined by b.ltoreq.7.5 and c.ltoreq.5.

A composite magnetic head comprising:

• a ferrite core including end faces opposing to each other and a recess receded from each of said opposing end faces,
• soft magnetic layers provided on said opposing end faces and defining a gap, and
• diffusion preventive SiO.sub.2 layers provided on an interface between said core and the soft magentic layers,
• wherein each of said soft magnetic layers has the composition Fe.sub.a Zr.sub.b N.sub.c where a, b and c denote the compositional ratios in atomic percent and the compositional range is such that
• 2<b.ltoreq.20 and
• <
• c.ltoreq.22
• with the exclusion of the range defined by b.ltoreq.7.5 and c.ltoreq.5.

A composite magnetic head comprising:

• a ferrite core including end faces opposing to each other and a recess receded from each of said opposing end faces,
• soft magnetic layers provided on said opposing end faces and defining a gap, and
• diffusion preventive SiO.sub.2 layers provided on an interface between said core and the soft magnetic layers,
• wherein each of said soft magnetic layers has the composition Fe.sub.a X.sub.b N.sub.c where a, b and c denote the compositional ratios in atomic percent and X denotes at least one selected from the group consisting of Hf, Ti, Nb, Ta, V, Mo and W and the compositional range is such that
• 0<b.ltoreq.20 and
• 0<c.ltoreq.22
• with the exclusion of the range defined by b.ltoreq.7.5 and c.ltoreq.5.

A composite magnetic head comprising:

• a ferrite core including end faces opposing to each other and a recess receded from each of said opposing end faces,
• soft magnetic layers provided on said opposing end faces and defining a gap, and
• diffusion preventive SiO.sub.2 layers provided on an interface between said core and the soft magnetic layers,
• wherein each of said soft magnetic layers has the composition Fe.sub.a B.sub.b N.sub.c where a, b and c denote the compositional ratios in atomic percent and B denotes at least one selected from the group consisting of Zr, Hf, Ti, Nb, Ta, V, Mo and W and the compositional range is such that
• 0<b.ltoreq.20 and
• 0<c.ltoreq.22
• with the exclusion of the range defined by b.ltoreq.7.5 and c.ltoreq.5.