Effect of Dzyaloshinskii-Moriya interaction on magnetic vortex switching driven by radial spin waves

TL;DR

This paper explores how Dzyaloshinskii-Moriya interaction influences magnetic vortex switching driven by radial spin waves, revealing phase transitions and DMI's role in facilitating vortex polarity switching, with implications for memory device design.

Contribution

It provides the first theoretical analysis of DMI effects on radial spin-wave induced vortex switching, including phase transition insights and spectrum analysis.

Findings

DMI induces a circular-to-radial vortex phase transition

DMI alters the spin-wave excitation spectrum with radial nodes

DMI significantly facilitates vortex polarity switching

Abstract

We theoretically investigate the radial-spin-wave induced magnetic vortex switching in the presence of Dzyaloshinskii-Moriya interaction (DMI). From micromagnetic simulations, we observe a circular-to-radial vortex phase transition by increasing the DMI strength. The radial spin-wave excitation spectrum for each magnetization configuration is analyzed, showing that the frequency of spin-wave mode with a given radial node number monotonically increases (decreases) with the DMI parameter of the radial (circular) vortex. Interestingly, we find that the DMI can significantly facilitate the polarity switching of the circular vortex driven by radial spin waves. Our work provides a new insight into the DMI effect on the vortex dynamics and is helpful for designing fast all-magnonic memory devices.