Hybrid finite element and fast Fourier on multipoles algorithm for micromagnetic modeling of perpendicular SOMA media

摘要

Self-Organized Magnetic Array (SOMA) is a promising candidate for future ultrahigh density recording media with an areal density of Tb/in{sup}2 and beyond [1]. Such type of recording media is composed of grains with a uniform size distribution and a non-magnetic coating to reduce exchange coupling. In this paper, a 3D finite element micromagnetic model is used to simulate the switch dynamics of SOMA recording system. The influence of media grain properties such as anisotropy field distribution is investigated. Our studies also include the signal to noise ratio (SNR) with respect to different bit-array alignments. The fluctuations of signal and noise are investigated under the condition that the transition location is shifted in a square assembled array.