“Super-Resonant” States in the Spectrum of Leaky Surface Magnon Polarons

For the first time, it has been shown that the hybridization of magnetoelastic and inhomogeneous exchange interactions can lead to the formation of interference-type bound states in the emission spectrum of leaky surface magnon polarons. In the vicinity of such “dark” states, their radiation width can be arbitrarily small (“super-resonance”), as a result of which, for an external quasi-plane (or quasi-harmonic) elastic wave incident on the magnetic layer, the longitudinal Schoch effect (or Wigner delay) increases indefinitely (in the nondissipative approximation) and the effects of zero scattering of the incident wave field and splitting of the reflected waveform are suppressed.