Micromagnetics Studies of CoX/Pt Media With Interfacial Anisotropy Based on Polycrystalline Structure Model Using Voronoi Tessellation Method

Abstract

A micromagnetic model based on a regular mesh is built to simulate CoX/Pt magnetic recording media containing a polycrystalline structure model using the Voronoi tessellation method. The crystal grains have to be segregated in media; thus, the two phases in crystalline grain and at grain boundary are treated separately. The demagnetizing field in a cell is calculated by the fast Fourier transform method, even if the $M_{s}$ distribution is highly nonuniform: in cells at grain boundary, $M^{\prime } _{s}$ is much smaller. The $M$ – $H$ loops are simulated with different media parameters, such as interfacial anisotropy field $H_{k}$ , grain boundary parameters, and magnetoelastic field in plane. The orientation distribution of $H_{k}$ has to be controlled to keep high perpendicular magnetization before flipping.