IDENTIFICATION OF MAGNETIC AFTEREFFECT MODEL PARAMETERS - COMPARISON OF EXPERIMENT AND SIMULATIONS

Previously, several aftereffect models were proposed in which Preisach type hysteresis transducers are driven by stochastic inputs. Such inp uts model random thermal perturbations which are the source of afteref fect 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 aftereff ect model parameters, Numerical simulations of the aftereffect model s how the well known log t-type decay in magnetization whose rate reache s a maximum near the coercive field. Comparison of these with experime ntal results from gamma-Fe2O3 recording media show excellent agreement . Based on this comparison, we propose a practical procedure to identi fy the stochastic parameters of the aftereffect model.