Magnetic Interactions in Assemblies of Single-Domain Particles. The Effect of Aggregation

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Abstract
A model is presented for describing the effect of magnetic interactions in assemblies of single‐domain particles, such as occur in magnetic recording tape coatings. Bundles of particles are hypothesized within which interaction takes the form of a demagnetizing field, but between which interaction is weak or absent. The switching fields of particles within a specified bundle are equal. This approach yields both a finite initial slope for the anhysteretic characteristic and a stable Preisach diagram. Thus it combines the attributes of a demagnetizing field model and a simple pair model. Relations among assorted magnetization characteristics that have been derived for a pair model follow more generally from a stable Preisach diagram and, therefore, do not serve to distinguish between microscopic models.