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The dynamics of the domain wall (DW) in a biaxial ferromagnet interactingwith a spin-polarized current are described by sine-gordon (SG) equationcoupled with Gilbert damping term in this paper. Within our frame-work of thismodel, we obtain a threshold of the current in the motion of a single DW withthe perturbation theory on kink soliton solution to the correspondingferromagnetic system, and the threshold is shown to be dependent on the Gilbertdamping term. Also, the motion properties of the DW are discussed for the zero-and nonzero-damping cases, which shows that our theory to describe the dynamicsof the DW are self-consistent.Comment: 7pages, 3figure

Dynamics of domain wall in a biaxial ferromagnet interacting with a spin-polarized current