The temperature dependence of the A-site sublattice magnetization in ferrimagnetic MnFe2O4 has been measured by observing the temperature dependence of the Mn55 NMR frequency. The initial deviation from saturation is proportional to T32 but no T52 term is observed. These results are found in agreement with a ferrimagnetic spin-wave calculation for the spinel lattice. Two T52 terms of opposite sign originate from the k4 terms of the dispersion relation and the k-dependent transformation coefficients from single sublattice spin-deviation operators to the diagonal spin-wave variables. These two terms cancel, for the spinel lattice, to within 1%.
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Heeger et al. (1964) studied this question.
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