SOFT MAGNETIC THIN FILM, METHOD FOR PREPARING SAME AND MAGNETIC HEAD

摘要

A soft magnetic thin micro-crystalline film of FeaBbNc (at %) wherein b is at least one of Zr, Hf, Ti, Nb, Ta, V, Mo and W, and 0 < b <1> (1 - 5 Oe) which is stable upon heating at elevated temperature for glass bonding. This film is produced by crystallizing an amorphous alloy film of the similar composition at 350 - 650 DEG C to a crystal grain size up to 30 nm to provide uniaxial anisotropy and increased magnetic permeability at higher frequency. It can also provide low magnetostriction around lambda s = 0. Composite magnetic head is made using this thin film. Diffusion preventive SiO2 layer disposed between ferrite core and this thin film in the magnetic head prevents an interdiffusion layer and suppress beat in the output signal.