マイクロマグネティクスの磁気記録への応用II先進的な磁気記録媒体モデル

摘要

Micromagnetic models are often used to investigate the potential of magnetic recording medium. For this purpose, an accurate model of the medium microstructure is essential if artifacts are to be avoided. In this paper we describe how micromagnetic simulations can be used to model magnetic recording media. Irregular grains and grain size distributions are modeled using Voronoi cells and methods to deal with magnetostatic interactions are presented. A treatment of intergranular exchange coupling across non-magnetic grain boundaries and between layers of dissimilar grains is proposed. The implications of sub-grain discretisation schemes on the simulated properties of exchangecoupledcomposite media grains are discussed. The effect of finite temperature on the switching field distribution is examined and a comparison of recording on media with regular and irregular grains is used to demonstrate the need for realistic microstructures.