Stabilization and dynamics of magnetic antivortices in a nanodisk with anisotropic Dzyaloshinskii-Moriya interaction

Abstract

We theoretically investigated the antivortex stabilized by anisotropic Dzyaloshinskii-Moriya interaction (DMI) in nanodisks. Remarkably, we found that the antivortex remains stable even when the nanodisk radius is reduced to 15 nm. We also investigated 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 basis 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 role of DMI in stabilizing topological solitons and their potential applications in spin-torque nano-oscillators and magnetic memories.