A MICROMAGNETIC MODEL OF DUAL-LAYER MAGNETIC-RECORDING THIN-FILMS

A micromagnetic model of dual-layer magnetic-recording thin films is described. The model, which is capable of simulating magnetic layers having different magnetic and geometric properties, is applied to the study of the magnetic properties of dual-layer media characterized by a three-dimensional isotropic distribution of anisotropy axes in both layers, using parameters typical of cobalt-alloy films. In the absence of exchange interactions between the layers, a correlation is found between squareness ratios, average magnetostatic energy densities, and structural dimensions of the media. An in-phase magnetization reversal of the layers is found to occur with increasing interlayer exchange coupling. A complex relationship is found between coercivity and media parameters.