Dark solitons in ferromagnetic chains with first- and second-neighbor   interactions
  We study the ferromagnetic spin chain with both first- and second-neighbor interactions. We obtained the condition for the appearance and stability of bright and dark solitons for arbitrary wave number inside the Brillouin zone. The influence of the second-neighbor interaction and the anisotropy on the soliton properties is considered. The scattering of dark solitons from point defects in the discrete spin chain is investigated numerically. 
M. T. Primatarowa and R. S. Kamburova
nlin.PS