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A series of weak absorption lines of unknown origin has been observed below the 8.7 cm−1 antiferromagnetic resonance (AFMR) in the far infrared transmission spectra of MnF2 powders. These extra modes appear in powders from different sources but are not present in the single crystal samples from which powders were prepared. Impurities are therefore unlikely to be the explanation. Conventional magnetostatic effects cannot account for sharp lines as far from the AFMR as those observed in the infrared spectra. The strongest mode, at 8.3 cm−1, shows the same magnetic splittings as the AFMR in low fields, yet is apparently not present in in 5 cm−1 microwave spectra measured at high field values. The integrated strengths of five lines observed between 7.4 cm−1 and 8.3 cm−1 increase as the particle size is reduced. Surface magnon modes have been predicted in this frequency range. However, the measured dependence on surface area of the 8.3 cm−1 mode intensity is not rapid enough to support this interpretation. Mic...

New resonance effects in antiferromagnetic MnF2