Effects of Dzyaloshinsky-Moriya Interaction on magnetism in Nanodisks

TL;DR

This study explores how Dzyaloshinsky-Moriya interactions influence magnetism in nanodisks, revealing effects on vortex phases, domain formation, and skyrmion creation through a new quantum simulation approach.

Contribution

It introduces a novel mean-field based quantum simulation method to analyze the impact of DM interactions on nanodisk magnetism, including domain and skyrmion formation.

Findings

Uniaxial anisotropy and transverse magnetic field increase magnetization and transition temperature.

Strong DM interaction leads to magnetic domain formation within nanodisks.

Magnetic fields can induce skyrmions in nanodisks with significant DM interaction.

Abstract

We give a theoretical study on the magnetic properties of monolayer nanodisks with both Heisenberg exchange and Dzyaloshinsky-Moriya (DM) interactions. In particular, we survey the magnetic effects caused by anisotropy, external magnetic field, and disk size when DM interaction is present by means of a new quantum simulation method based on mean-field theory. This computational approach finds that uniaxial anisotropy and transverse magnetic field enhances the net magnetization as well as increases the transition temperature of the vortex phase while preserving the chiralities of the nanodisks. Whereas, when the strength of DM interaction is sufficiently strong for a given disk size, magnetic domains appear within the circularly bounded region, which vanish and gives in to a single vortex when a transverse magnetic field is applied. The latter confirms the magnetic skyrmions induced by the magnetic field as observed in the experiments.