Ordering Mixed-Q Topological Magnetism into Lattice via Moire Engineering

TL;DR

This paper introduces a mechanism using moire engineering to organize disordered mixed-Q topological magnetic textures into a regular lattice, advancing the understanding of complex spin configurations for spintronics.

Contribution

It proposes a generic approach to create ordered mixed-Q topological magnetic lattices via moire potential, validated in twisted bilayer CrGaTe3.

Findings

Moire potential stabilizes mixed-Q topological textures into a lattice.

Phase evolution depends on twist angle and biaxial strain.

Validated mechanism through first-principles and spin simulations.

Abstract

Topological magnetic lattices offer a fertile ground for exploring fundamental physics and developing novel spintronic devices. However, current research is predominantly confined to single-Q topologies hosting uniform type of quasiparticle. The realization of exotic mixed-Q states, where distinct topological quasiparticles co-assemble into an ordered lattice, remains largely unexplored. Here, we propose a generic mechanism to order disordered mixed-Q topological magnetism into periodic lattice via moire engineering. By leveraging the synergy between spatially modulated interlayer coupling and intrinsic intralayer magnetic frustration, we demonstrate that moire potential can effectively regularize skyrmions, antiskyrmions, and magnetic bubbles into a hybrid lattice. Combining first-principles with atomistic spin simulations, we validate this mechanism in twisted bilayer CrGaTe3, identifying it as an exemplary platform for hosting these complex ordered textures. We systematically map the phase evolution as a function of twist angle and biaxial strain, unveiling the critical role of moire potential in stabilizing mixed-Q lattice. Our findings significantly advance the frontier of topological and moire spintronics.