Analytical modelling of perpendicular recording

An analytical model for perpendicular magnetic recording is presented which is capable of calculating ´ab-initio´ the magnetisation distributions written by an ´arbitrary´ head field into both single and double layer recording media. Magnetisations are shown to follow the head field distribution existing at the medium´s top surface. Application of the theory allows prediction of many of the fundamental features of the perpendicular write/read cycle, e.g. transition widths, replay pulse shapes, D50values etc.