Topological spin textures in chiral magnets on the honeycomb lattice with magnetic fields

TL;DR

This paper investigates topological spin textures like skyrmions in a honeycomb lattice model under magnetic fields, revealing various field-induced phases and providing insights for experimental identification.

Contribution

It introduces a comprehensive Monte Carlo study of topological spin textures on a honeycomb lattice with magnetic fields, highlighting new field-induced phases.

Findings

Discovery of field-induced incommensurate skyrmion superlattices

Identification of mixed skyrmion-bimeron states and vortex phases

Analysis of topological charge and structure factors

Abstract

Topological spin textures, like skyrmions, have significant potential for spintronics applications. The main purpose of this work is to study further the topological spin textures on the discrete lattice with magnetic fields. In this work, we study a classical rotated Heisenberg model with Dzyaloshinskii-Moriya interaction, bond-dependent anisotropy and easy-axis anisotropy on the honeycomb lattice via Monte Carlo simulations. We mainly focus on phase diagrams with magnetic fields, especially on the non-trivial phases only existing with fields. The results demonstrate the emergence of field-induced incommensurate skyrmion superlattice including mixed skyrmion-bimeron states, ferromagnetic star, vortex and z-vortex superlattice. We systematically analyze structures of these topological spin textures through spin configurations, structure factors, topological charge and vector chirality. We hope that our results could be useful for the identification of topological phases experimentally.