Spirals and skyrmions in antiferromagnetic triangular lattices
Spirals and skyrmions in antiferromagnetic triangular lattices
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DOI：
10.1103/physrevmaterials.5.054401
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发表时间：
2021-02
影响因子：
3.4
通讯作者：
W. Fang;A. Raeliarijaona;Po-Hao Chang;A. Kovalev;K. Belashchenko
中科院分区：
文献类型：
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作者：
W. Fang;A. Raeliarijaona;Po-Hao Chang;A. Kovalev;K. Belashchenko
我们研究了在反转对称破缺衬底上三角晶格二维反铁磁体中螺旋和skyrmions的实现。作为一种可能的材料实现，我们研究了过渡金属原子（Cr，Mn，Fe或Co）在MoS 2，WS 2或WSe 2单层上的吸附，并使用第一性原理计算获得了交换，各向异性和Dzyaloshinskiii-Moriya相互作用参数。使用能量最小化和并行回火蒙特卡罗模拟，我们确定了磁相图的相互作用参数范围很广。我们发现，即使在弱的Dzyaloshinskiii-Moriya相互作用下，skyrmion晶格也可以出现，但它们的稳定性受到磁各向异性的阻碍。然而，弱的易平面磁各向异性可以贝内稳定skyrmion相位。结果表明，Cr/MoS 2、Fe/MoS 2和Fe/WSe 2界面上都存在120 π反铁磁态形成的自旋螺旋.我们的结果进一步表明，对于界面，如Fe/MoS 2，Dzyaloshinskiii-Moriya相互作用足够强，可以在实验可行的外部磁场存在下将系统驱动到三个子晶格skyrmion晶格。
We study realizations of spirals and skyrmions in two-dimensional antiferromagnets with a triangular lattice on an inversion-symmetry-breaking substrate. As a possible material realization, we investigate the adsorption of transition-metal atoms (Cr, Mn, Fe, or Co) on a monolayer of MoS 2 , WS 2 , or WSe 2 and obtain the exchange, anisotropy, and Dzyaloshinskii-Moriya interaction parameters using first-principles calculations. Using energy minimization and parallel-tempering Monte Carlo simulations, we determine the magnetic phase diagrams for a wide range of interaction parameters. We find that skyrmion lattices can appear even with weak Dzyaloshinskii-Moriya interactions, but their stability is hindered by magnetic anisotropy. However, a weak easy plane magnetic anisotropy can be beneficial for stabilizing the skyrmion phase. Our results suggest that Cr/MoS 2 , Fe/MoS 2 , and Fe/WSe 2 interfaces can host spin spirals formed from the 120 ◦ antiferromagnetic states. Our results further suggest that for interfaces, such as Fe/MoS 2 , the Dzyaloshinskii-Moriya interaction is strong enough to drive the system into a three-sublattice skyrmion lattice in the presence of experimentally feasible external magnetic field.