Interaction of a shear wave with a moving domain wall in an iron garnet crystal

The boundary-value problem of the interaction of a plane monochromatic shea r wave with a moving Bloch wall in an iron garnet crystal is solved in the framework of the nonexchange magnetostatic approximation on the basis of th e method of phase invariants for wave problems with moving boundaries. For a shear wave incident on the domain wall, the possibility of the reflection less birefringence is demonstrated. Numerical results illustrating the reso nance properties of the magnetic subsystem are presented. It is established that, at the upper bound of the reflectionless birefringence range, the in teraction of the shear wave with the domain wall manifests itself as a dege nerate resonance with the solution in the form of two combined antiphase, c ollinearly propagating shear waves of infinitely large amplitudes, which fo rm a zero resulting field. (C) 2001 MAIK "Nauka/Interperiodica".