Abstract
The exchange constant, A, for a magnetic bubble garnet is calculated using a ferrimagnetic molecular field model. This model predicts the temperature dependence of A for a given material as a function of Néel temperature and nonmagnetic ion substitution into the tetrahedral and octahedral sites of the garnet crystal lattice. Most of the available data for A from representative bubble garnets yields good agreement with the calculations. Approximate determination of A from the model should be useful for characterizing new magnetic bubble materials as a function of temperature.
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