Antiferromagnetic resonance has been observed in powdered MnO at 364 μ at 1.5°K. The resonance frequency as a function of temperature falls roughly as the square root of the Brillouin function of spin 52. Fields of the order of 104 oe have no observable effect on the line at 1.5°K. All of these results give quantitative confirmation of a model in which the sublattice magnetizations are constrained to a (111) plane by magnetic dipolar interactions and are held to a preferred direction within the plane by a much weaker anisotropy.
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Keffer et al. (1961) studied this question.
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