Micromagnetic model analysis of planar-type write head field response and dependence on pole tip, return yoke, and shield structure

We used a micromagnetic model to investigate the high-frequency (1-5 GHz) response, peak recording field strength, recording field gradient, and adjacent track erasure (ATE) field for various main pole tip, shield, and return yoke structures in planar type heads. The effect of the pole tip area at the air-bearing surface (ABS) and the return yoke structure is also discussed. It was found that the pole tip and shield arrangement had a major effect on the peak recording field strength, recording field gradient, and ATE field, i.e., the trailing and side shields work to reduce the undesired field, however, they also slow the head field response due to the interaction between the main pole tip and the shield. The field responses are also dependent on the main pole tip-shield structures and pole tip structures. The return yoke thickness and area were important determinants of response speed and peak field.