We theoretically study field-induced domain wall (DW) motion in an electrically insulating ferromagnet with hard- and easy-axis anisotropies. DWs can propagate along a dissipationless wire through spin wave emission locked into the known soliton velocity at low fields. In the presence of damping, the mode appears before the Walker breakdown field for strong out-of-plane magnetic anisotropy, and the usual Walker rigid-body propagation mode becomes unstable when the field is between the maximal-DW-speed field and Walker breakdown field.
@article{arxiv.1206.6244,
title = {Domain wall propagation through spin wave emission},
author = {X. S. Wang and P. Yan and Y. H. Shen and G. E. W. Bauer and X. R. Wang},
journal= {arXiv preprint arXiv:1206.6244},
year = {2014}
}