シールドを有する単磁極ヘッドのマイクロマグネティック解析

概要

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A micromagnetic analysis of single-pole-type (SPT) heads with side and trailing shields, which are indispensable for obtaining higher values of both track and linear densities, was carried out. First, quasi-static recording field distributions were obtained for various SPT shield structures and compared with those obtained from a static finite element method (FEM) analysis. The recording fields under the main pole were in good agreement, while some discrepancies were found below the shields and the return yoke. Next, time variations of the head field and magnetization processes were obtained for a high-frequency recording current and for various shield structures. Magnetization rotation in the main pole tip, which is the origin of the dynamic recording field, was strongly affected by the magnetization in the side and trailing shields.