Abstract
The spectrum of excitations of a 180° domain wall in a cubic crystal with light uniaxial anisotropy is studied. Numerically, we have found high-frequency branches. The low-frequency (Goldstone) branch of excitations has a square-root long-wavelength singularity in almost all directions of the wave vector. For this branch our asymptotic long-wave expansion gives the angular dependence of the singular contribution.
- Received 22 October 1991
DOI:https://doi.org/10.1103/PhysRevB.48.9569
©1993 American Physical Society