Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
School of Physics, University of Electronic Science and Technology of China, Chengdu, 611731, China.
Phys Chem Chem Phys. 2022 Dec 21;25(1):96-105. doi: 10.1039/d2cp03860a.
Using first-principles calculations and micro-magnetic simulations, we propose a Janus MnSbBiSeTe (MSBST) monolayer derived from the MnBiTe (MBT) ferromagnet and investigate the influence of biaxial strain on the electronic structures, topological characteristics and spin textures. Different from pristine MBT with an out-of-plane easy axis, the anisotropy of MSBST prefers an in-plane direction. Intriguingly, switching the easy axis direction of MSBST will significantly modify the band structure. Topological phase transition can be achieved by applying a compressive strain, making MSBST become a topological insulator with . Moreover, due to the inherent inversion asymmetry of Janus MSBST, a large Dzyaloshinskii-Moriya interaction (DMI) is induced for generating and stabilizing skyrmions. By micro-magnetic simulations, the results of spin textures show that the skyrmions phase can be achieved in MSBST with an external magnetic field of 0.8 T. Our findings provide guidelines for the development and application of spintronic devices with nontrivial topological properties and a large DMI.
我们使用第一性原理计算和微磁模拟，提出了一种源自 MnBiTe（MBT）铁磁体的 Janus MnSbBiSeTe（MSBST）单层，并研究了双轴应变对其电子结构、拓扑特性和自旋织构的影响。与具有面外易轴的原始 MBT 不同，MSBST 的各向异性倾向于面内方向。有趣的是，改变 MSBST 的易轴方向将显著改变能带结构。通过施加压缩应变可以实现拓扑相变，使 MSBST 成为具有 的拓扑绝缘体。此外，由于 Janus MSBST 的固有反演不对称性，会产生大的 Dzyaloshinskii-Moriya 相互作用（DMI），从而产生和稳定 skyrmions。通过微磁模拟，自旋织构的结果表明，在外磁场为 0.8 T 的情况下，可以在 MSBST 中实现 skyrmions 相。我们的研究结果为开发和应用具有非平凡拓扑性质和大 DMI 的自旋电子器件提供了指导。
