Low Temperature Physics: 46, 824 (2020); https://doi.org/10.1063/10.0001549
Antiferromagnet as the tunable single-phase elastic hyperbolic medium with the spatial dispersion
S.V. Tarasenko and V.G. Shavrov
Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Moscow 125009, Russia
Received March 25, 2020, published online June 22, 2020
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.