Stabilizations and field-driven core reversals of magnetic vortices in Fe3Sn2 disks

Abstract

A magnetic vortex is a structure with a polarized core surrounded by an in-plane spin swirl and was first reported in easy-plane disks. Here, we explore the effects of the disk thickness, temperature, and out-of-plane field on the magnetic vortex stabilization and core reversals in Kagome uniaxial ferromagnetic Fe3Sn2 disks. Magnetic ground domains in Fe3Sn2 disks turn from stripes to vortices after decreasing the disk thickness or temperature as the easy-plane anisotropy wins the competition with the uniaxial magnetocrystalline anisotropy. Topological transformations from charge Q=−1/2 vortices at a zero field to Q=−1 skyrmion-like configurations at a high out-of-plane field were identified in cooperation with micromagnetic simulations. Thus, our results promote future vortex-based spintronic applications.

Current-driven dynamics of skyrmion bubbles in achiral uniaxial magnets

“…A previous study has shown that the magnetic ground state in ferromagnetic nanodisks with 𝜂 < 1 can be manipulated by thickness. [37] In our case of 𝜂 = 0.22, the skyrmion bubble cannot be stabilized when the thickness of the nanostripe is smaller than 65 nm for 𝜂 = 0.22. The small 𝜂 suggests that dipole-dipole interaction plays a vital role in stabilizing the skyrmion bubble.…”

Size driven barrier to chirality reversal in electric control of magnetic vortices in ferromagnetic nanodiscs

“…The induced magnetic field amplitudes capable of chirality reversal for the 20 nm thick disc are not very different from that reported in ref. 47 both via experiments and via micromagnetic simulations, pointing out to the local nature of the reversal process as the dimensions of the discs studied therein are considerably greater. The foregoing discussion focuses on the disc thickness for a fixed disc diameter.…”