Domain wall motion influenced by a standing spin wave in antiferromagnetic systems

In antiferromagnetic systems, spin dynamics are described by coupled Landau-Lifshitz-Gilbert equation for two order parameters of staggered and magnetic moments. It is also known that the time-varying magnetic field drives a collective motion of domain wall (DW). By using a micromagnetic simulation, we investigate a coupling effect between the spin wave and the DW motion which can be simultaneously driven by the oscillating magnetic field. In an antiferromagnetic nano-rod, a standing spin wave can be formed when its length is multiples of the wavelength of the excited spin wave. Depending on a phase relationship between the DW position oscillation and the standing spin wave, we find that the DW position oscillation is significantly influenced; its oscillation amplitude becomes negligible in the out-of-phase condition, and is enhanced by about twice in the in-phase condition.