A brief overview of magnetic ordering in solids is presented and the basic principles of mean‐field theory are outlined. An algorithm for determining the molecular field coefficients of ferrimagnetic materials having several magnetic sublattices is developed that reproduces the observed temperature dependence of magnetization. The method is then applied to several ferrimagnetic garnets having very different thermomagnetic properties. The calculations were performed on a Macintosh II computer running MATHEMATICA■.

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