  We study the magnetic soliton dynamics of spinor Bose-Einstein condensates in
an optical lattice which results in an effective Hamiltonian of anisotropic
pseudospin chain. A modified Landau-Lifshitz equation is derived and exact
magnetic soliton solutions are obtained analytically. Our results show that the
time-oscillation of the soliton size can be controlled in practical experiment
by adjusting of the light-induced dipole-dipole interaction. Moreover, the
elastic collision of two solitons is investigated.
