New Double-Laminated Head with Fe-Based Alloy Film for High-Frequency Use

Abstract

In a previously developed double-laminated Fe-based alloy film head, it is thought that local permeability deterioration around the magnetic gap causes disagreement between the actual output and the value estimated from the permeability observed in the solid film. Accordingly, a new double-laminated Fe-based alloy film was developed, making full use of the techniques of double lamination, anisotropy modulation control, and magnetostatic coupling. No severe deterioration of the film‘s permeability caused by its shape factor was observed. The bulk head using this film exhibited higher reproduction output in a wider frequency range without any frequency ripples, resulting in a 7 dB output improvement at 28 MHz over a conventional laminated head using Co-based amorphous alloy film.