Antiferromagnet as the tunable single-phase elastic hyperbolic medium with the spatial dispersion

For a plane and quasi-plane SH-type volume wave incident from the outside onto a system of equidistant antiferromagnetic dielectric layers, taking into account spatial dispersion in an antiferromagnet as a hyperbolic magnetoacoustic medium induc-es a number of resonant refractive anomalies including the effects of total reflection (propagation) and formation against the back-ground continuous spectrum of discrete localized magnon-phonon states, amplification of the angular Schoch effect and in the case of a one-dimensional resonant magnetic phonon crystal — to the effect of superradiance.

Key words: magnetoacoustics, magnetoacoustic wave, resonant magnetic phonon crystal.

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