Bloch-type magnetic skyrmions in two-dimensional lattice

TL;DR

This paper reports the discovery of Bloch-type magnetic skyrmions in a two-dimensional MnInP2Te6 lattice, revealing new topological magnetic phenomena driven by symmetry and spin-orbit effects without external magnetic fields.

Contribution

It introduces the first observation of Bloch-type skyrmions in 2D lattice materials, expanding the understanding of topological magnetism in low-dimensional systems.

Findings

Bloch-type skyrmions found in MnInP2Te6 monolayer

Skyrmions arise from symmetry and spin-orbit coupling effects

Phase diagrams of skyrmions under various conditions mapped

Abstract

Magnetic skyrmions in two-dimensional lattice are a prominent topic of condensed matter physics and material science. Current research efforts in this field are exclusively constrained to Neel-type and antiskyrmion, while Bloch-type magnetic skyrmions are rarely explored. Here, we report the discovery of Bloch-type magnetic skyrmions in two-dimensional lattice of MnInP2Te6, using firstprinciples calculations and Monte-Carlo simulations. Arising from the joint effect of broken inversion symmetry and strong spin-orbit coupling, monolayer MnInP2Te6 presents large Dzyaloshinskii-Moriya interaction. This, along with ferromagnetic exchange interaction and out-ofplane magnetic anisotropy, gives rise to skyrmion physics in monolayer MnInP2Te6, without needing magnetic field. Remarkably, different from all previous works on two-dimensional lattice,the resultant magnetic skyrmions feature Bloch-type, which is protected by D3 symmetry.Furthermore, the Bloch-type magnetic bimerons are also identified in monolayer MnTlP2Te6. The phase diagrams of these Bloch-type topological magnetisms under magnetic field, temperature and strain are mapped out. Our results greatly enrich the research on magnetic skyrmions in twodimensional lattice.