We demonstrate how the interpretation of high-resolution far-infrared reflectivity and ATR spectra allows the mapping out of experimentally determined dispersion curves for the antiferromagnet . The dispersion curves clearly summarize the relationship between frequency and wave vector of magnetic polaritons, and show the position of the bulk and surface modes and surface resonances in zero, low and relatively strong applied fields. Surface resonances which exist only in the presence of damping are identified. In addition we show how far-infrared measurements can provide independent measurements of material parameters such as the exchange and anisotropy fields and the sublattice magnetization.
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Jensen et al. (1997) studied this question.
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