The microwave resonance absorptions in antiferromagnetic materials, MnS, MnO and MnSe, at 3.2cm wave-length were studied by using a specially designed rectangular cavity at low temperature. The curves of resonance absorption versus d c magnetic field for these materials were obtained at various temperatures ranging from -195℃ to 78℃. The height of the resonance absorption decreased and absorption line became broad with decreasing temperature, especially below the Curie temperature. The position of the maximum was found to be a constant magnetic field at 3510 Oe over these temperature ranges. The results have been discussed in comparison with the theoretical studies of magnetic resonance in antiferromagnetic materials.
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Okamura et al. (1951) studied this question.
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