A very small circular dichroism (CD) was observed nearly 30 years ago in the magnon sidebands of the simple rutile antiferromagnetic fluorides, MnF₂ and CoF₂, at low temperatures. The source of this CD was not understood. Recent Raman circular intensity differential studies of the one-magnon Raman scattering in FeF₂ has revealed that the degeneracy of the antiferromagnetic magnon branches is lifted by a weak magnetic dipole-dipole interaction, as predicted by Pincus and Loudon and by White four decades ago. The origin of the observed CD in the magnon sidebands can now be traced to this same magnetic-dipole induced splitting.
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Lockwood et al. (2004) studied this question.
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