Anisotropic Dzyaloshinskii-Moriya interaction protected by D2d crystal symmetry in two-dimensional ternary compounds
Yonglong Ga, Qirui Cui, Yingmei Zhu, Dongxing Yu, Liming Wang, Jinghua Liang, Hongxin Yang
Abstract
Abstract Magnetic skyrmions, topologically protected chiral spin swirling quasiparticles, have attracted great attention in fundamental physics and applications. Recently, the discovery of two-dimensional (2D) van der Waals (vdW) magnets have aroused great interest due to their appealing physical properties. Moreover, both experimental and theoretical works have revealed that isotropic Dzyaloshinskii–Moriya interaction (DMI) can be achieved in 2D magnets or ferromagnet-based heterostructures. However, 2D magnets with anisotropic DMI haven’t been reported yet. Here, via using first-principles calculations, we unveil that anisotropic DMI protected by D 2d crystal symmetry can exist in 2D ternary compounds M Cu X 2 ( M : 3d transition metal (TM), X : group VIA). Interestingly, by using micromagnetic simulations, we demonstrate that ferromagnetic (FM) antiskyrmions, FM bimerons, antiferromagnetic (AFM) antiskyrmions, and AFM bimerons can be realized in the M Cu X 2 family. Our discovery opens up an avenue to creating antiskyrmions and bimerons with anisotropic DMI protected by D 2d crystal symmetry in 2D magnets.