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The coupling of photons with long-wavelength magnons in antiferromagnetic MnF₂ in the presence of an externally applied magnetic field in the body c direction is investigated. It is found that two pure, circularly polarized modes can propagate in the crystal along the direction of the magnetic field. A study of the reflection spectra for normally incident plane-polarized radiation reveals that an antiferromagnetic crystal in an applied magnetic field can be used as an optical device to obtain pure, circularly polarized radiation.
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Bose et al. (1975) studied this question.
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