  We theoretically investigate the antivortex stabilized by anisotropic
Dzyaloshinskii-Moriya interaction (DMI) in nanodisks. It is remarkably found
that the antivortex remains stable even when the nanodisk radius is reduced to
15 nm, owing to the short-range nature of the DMI. We also investigate the
antivortex dynamics under a static in-plane magnetic field, which shows that
the displacement of the antivortex core depends on its vorticity and helicity,
providing a fundamental basic for distinguishing different vortex types.
Additionally, spin-polarized currents can trigger a self-sustained gyration of
the antivortex at low current densities, while inducing polarity switching at
high current densities. Our findings offer valuable insights into the DMI role
in stabilizing topological solitons and their potential applications in
spin-torque nano-oscillators and magnetic memories.
