Domain wall dynamics driven by a circularly polarized magnetic field in ferrimagnet: effect of Dzyaloshinskii–Moriya interaction

In this work, we study the domain wall motion in ferrimagnet driven by a circularly polarized magnetic field using the collective coordinate theory and atomistic micromagnetic simulations, and we pay particular attention to the effect of Dzyaloshinskii–Moriya interaction (DMI). Similar to the case of antiferromagnetic domain wall, ferrimagnetic wall moves at a speed which is linearly dependent on the DMI magnitude. In addition, it is revealed that the DMI plays a role in modulating the domain wall dynamics similar to that of the net spin density, which suggests another internal parameter for controlling domain wall in ferrimagnets. Moreover, the results show that the domain wall dynamics in ferrimagnets is much faster than that in ferromagnets, which confirms again the great potential of ferrimagnets in future spintronic applications. Graphical abstract