トレーリングシールドを有するSPTヘッド磁界のマイクロマグネティック計算

概要

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A micromagnetic simulator for a single-pole-type (SPT) writing head that takes into account the full interactions between the head core and the recording medium was accelerated by introducing the Fast Fourier Transform (FFT) into all the magnetostatic calculations. This enabled the head field and the recording process on a medium to be simultaneously calculated which is advantageous for designing a perpendicular magnetic recording head and medium system. If the head field strength is sufficiently large to realize saturation recording, the recording performance of the SPT head with a trailing shield was considerably improved by positioning the trailing shield, although the increase in the head's field gradient was slight. This result indicates that the head's field gradient is one of the most important factors for increasing linear recording density.Key words : micromagnetics, single-pole-type head, trailing shield, perpendicular magnetic recording