Simulation Study of the Robustness of a Single-Pole Head with Respect to a Stray Field

Abstract

It had been pointed out that a small magnetic stray field can easily demagnetize written bits in a perpendicular double-layer disk associated with a single-pole writing head. The robustness of the single-pole head with respect to the stray field was therefore investigated by computer simulation based on the finite element method. The results indicated that less sensitivity, or better robustness, with respect to the stray field was attained by decreasing the permeability of the soft magnetic underlayer of the disk, which is considered to be consistent with experimental results.