Abstract
Using a model of interacting fine ferromagnetic particles, a Monte Carlo technique has been developed to investigate the effect of the initial value of the ac field on the anhysteretic process. Remanence and susceptibility curves are calculated for the ideal (unmodified) and the modified anhysteretic process. The shape of the curves is consistent with measurements on magnetic tapes under ac biasing conditions. An important result of the computational calculations is that the modified susceptibility curves exhibit the well known overbiasing effect. Computed initial susceptibilities depend on packing fraction to first order. Second-order effects can arise from variations of temperature and particle size and are interpreted by considering the shape of the switching field distribution.
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