Writing performance of narrow trackwidth single pole perpendicular heads

Abstract

The writing performance of narrow trackwidth single pole heads was studied on double layer perpendicular media. The main pole of the head was made of high moment Fe–Si–N laminated with Si–N. The narrow poles were made by trimming the wide main pole with an FIB milling system. Saturation recording was achieved by a 0.3 μm trackwidth head for media composed of a Co/Pd or Co–Cr–Nb–Pt recording layer and a Ni–Fe–Nb soft magnetic backlayer. With this head, clear recorded patterns were obtained. It was found that the number of reversed magnetic domains decreased remarkably as the trackwidth was reduced. The MFM images of 0.14 μm trackwidth recording at 400 kFRPI reveals a potential for recording densities exceeding 50 Gbit/in.2