SIMULATIONS OF THE REMANENT BEHAVIOR OF LONGITUDINAL THIN-FILMS

A computer model of a longitudinal thin film has been developed and applied to a study of the remanent behaviour of the films. The exchange coupling between grains is shown to give rise to a difficulty of obtaining an ac erased state, this being interpreted in terms of the resultant cooperative magnetisation reversal involving large areas of the film. Exchange coupling is also responsible for the positive delta I parameter determined by comparison of remanence curves. However, the delta I plot is shown to be dependent on the detailed behaviour of exchange and magnetostatic coupling between grains.