Abstract
A new procedure for investigating the switching behaviour of differently oriented particles in polycrystalline samples is introduced where the particle interaction is taken into account by the mean demagnetizing field. Based on specific remanence measurements the angular and field dependence of the probability of irreversible magnetization reversals (switching) is determined. This includes also the switching field distribution (SFD) of the material. The procedure is applied to a barium ferrite sample compacted from small particles. Due to the interaction the angular dependent switching fields are shifted to lower values compared to those predicted by the Stoner–Wohlfarth model and those measured for a strongly diluted sample, whereas the SFD is changed only slightly. This result as well as measurements of the initial susceptibility confirm single–domain particle behaviour of this material. Starting from our result for the switching probability it is shown that the angular dependence of the switching field can be deduced from angular dependent measurements of remanence coercivity only for samples with a very high degree of grain alignment. The determined probability is confirmed by comparing calculated and measured field dependence of the conventional remanence for the investigated material.
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