Identification of magnetic aftereffect model parameters: comparison of experiment and simulations

Abstract

Previously, several aftereffect models were proposed in which Preisach type hysteresis transducers are driven by stochastic inputs. Such inputs model random thermal perturbations which are the source of aftereffect phenomena. In this article, we compare experimental and numerical simulation results for the first time in order to verify the proposed models, and present an identification procedure to determine aftereffect model parameters. Numerical simulations of the aftereffect model show the well known log t-type decay in magnetization whose rate reaches a maximum near the coercive field. Comparison of these with experimental results from /spl gamma/-Fe/sub 2/O/sub 3/ recording media show excellent agreement. Based on this comparison, we propose a practical procedure to identify the stochastic parameters of the aftereffect model.