Oscillating Solitons Pinned to a Nonmagnetic Impurity in Layered   Antiferromagnets
  We argue that an oscillatory motion of impurity-pinned solitons may occur in layered antiferromagnetic compounds. The characteristic frequencies of these modes, that may be detected by resonance or inelastic neutron scattering, are estimated analytically and depend on the soliton sizes and types . 
L.A.S. M\'ol, A.R. Pereira and W.A. Moura-Melo