Abstract
Solitons in magnetic chains are moving domain walls, separating spin-up and spin-down regions in a ferromagnet, or the two different (degenerate) ordered configurations in an antiferromagnet. We discuss a few experiments which probe the existence of these nonlinear excitations in quasi 1-d magnetic materials, including neutron scattering, NMR, Mössbauer effect, and ac susceptibility. We further consider the application of the soliton model to the antiferromagnetic (H-T) phase diagram and to the problem of spin-Peierls dimerization.