Antiferromagnetic resonance in a linear chain antiferromagnet (CH 3 ) 4 NMnCl 3 was observed below 1 K. The experimental results support a spin structure model of the easy plane type in the c -plane. However, the spin configuration in the plane is not determined, and the observed three resonance lines are difficult to explain satisfactorily. The zero field spin wave energy was estimated to be about 0.8 cm -1 . A temperature dependent shift of the resonance point is found at low temperatures, and it was attributed to the nuclear hyperfine anisotropy shift.
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Okuda et al. (1978) studied this question.
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