Modeling of multilayer thin film recording media

A previously developed micromagnetic model for single-layer thin-film recording media is extended to model multilayer thin-film media. Effects of the magnetostatic interactions between the adjacent magnetic layers in the film are studied for a film with two magnetic layers separated by an ideal nonmagnetic layer. Magnetization reversal processes and hysteresis properties are studied for films with different separation layer thicknesses. It is found that the magnetostatic interaction between the two adjacent magnetic layers in the multilayer films with an ideal thin nonmagnetic interlayer can result in significant changes of micromagnetic behavior within each magnetic layer. This micromagnetic modeling study explains why reducing the separation thickness can yield further reduction of the medium noise