Spectrum of 180° Bloch-type domain-wall excitations in yttrium iron garnet
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.
- Publication:
-
Physical Review B
- Pub Date:
- October 1993
- DOI:
- 10.1103/PhysRevB.48.9569
- Bibcode:
- 1993PhRvB..48.9569M
- Keywords:
-
- 75.60.Ch;
- Domain walls and domain structure