Remanence measurements have been proposed as a means of estimating the amount of intergranular exchange present in thin-film recording media. A micromagnetic model is used to compute remanence curves starting from a DC-saturated state and an AC-erased state, for a range of media parameters. It is found that the amount of intergranular exchange is the most important parameter determining the difference delta M between these two curves; however, the interpretation is clouded somewhat by the effect of anisotropy and other parameters.>
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Beardsley et al. (1991) studied this question.