Atomistic Study of Current-driven Dynamics of Multi-sublattice Skyrmions*

Magnetic skyrmions, two-dimensional quasiparticles formed by a local twist in the magnetization, are great candidates for use in novel spintronic devices, but there is a pressing need to better understand their dynamic stability, maximum speed of propagation through magnetic media, and mechanisms of dynamic deformation effects. Here, the unique capabilities of fully atomistic modelling in the VAMPIRE software, in conjunction with the Thiele formalism, are used to perform an extensive and systematic study of skyrmion dynamics driven by spin orbit torque in materials with varying angular momentum compensation. We identify and analyze the nature of dynamic deformations of travelling skyrmions in both ferrimagnetic and antiferromagnetic materials, calculate the local gyrotropic, dissipation and driving forces from numerical simulation data, and analyze the effect of angular momentum compensation value on skyrmion dynamics. These results expand the understanding of the fundamental properties of magnetic skyrmions, in particular, their dynamical stability, ability to reach high velocities and dependence thereof on material parameters, paving the way for their potential use in spintronic applications.