Dynamics of skyrmion textures in thin ferrimagnetic films

The article focuses on the micromagnetic modeling of the nucleation, energetic stability regions, and dynamic of chiral spin textures in thin-film heavy-metal/ferromagnetic (FM) systems with Dzyaloshinskii–Moriya interaction. A simple two-layer model for analyzing ferrimagnetic (FIM) structures is proposed. The analytical description and simulation of the mechanisms of stabilization and current-induced motion of skyrmions in both FM and FIM films are carried out, depending on the parameters of the magnetic model and the external magnetic field. The influence of the magnetization, magnetic anisotropy, and damping on the parameters and velocity of skyrmions (e.g. size, stability regions etc.) in thin-film structures is estimated. The specific dynamics of skyrmion motion under the influence of spin-polarized current as a function of the magnitude and sign of the Dzyaloshinskii–Moriya interaction is also identified. The results demonstrate the promising potential of FIM films for skyrmions stabilization and investigation of its dynamics.