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The presence of a strong hyperfine coupling in the antiferromagnets KMnF₃ and CsMnF₃ leads to a strong intermixing of the nuclear magnetic resonance and antiferromagnetic resonance (AFR) modes at low temperatures. In the experiments described here, Mn⁵⁵ resonance absorption is detected by monitoring the field for AFR while driving at appropriate nuclear frequencies. Such resonance absorption is observed for a range of frequencies many times larger than the nuclear linewidth. A spin-pinning model is proposed which provides nucleation centers for this "off-resonance" saturation.
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Witt et al. (1964) studied this question.
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