Design of a single-edge-sensitive thin film head core with perpendicular double layer medium

Achieving both high resolution and high read/write efficiency has been tried with a rather thick single-pole-head film core having the sensitive (ordinary) trailing edge and the less sensitive leading edge in the neighborhood of which a degradation of the magnetic flux density (Bs) is made. The degradation is made by laminating several sputtered layers of different alloy constitution of Co1-xZrx(x = 0.17-0.32). The whole film core consists of this degradation region of 4.2 μm thick and high permeability Co0.85Zr0.03Nb0.12region of 5.0 μm thick. Observed shallowing of the reproduce nulls in the wavelength response with the rather thick core shows a possible compatibility of the resolution and the efficiency.