Hysteresis Loops of Mixtures of Ferromagnetic Micropowders

Abstract

A treatment is given of the hysteresis loops of dilute mixtures of various sizes of ferromagnetic particles. Three ranges of particle size are considered: very small particles called ``super‐paramagnetic'' which are single domain and equilibrate resulting from thermal vibrations, single domain particles which are large enough that they do not equilibrate, and particles large enough to contain many domains in equilibrium. The results are compared to experiment.