论文标题
来自各向异性对称交换的自发性晶格
Spontaneous skyrmionic lattice from anisotropic symmetric exchange in a Ni-halide monolayer
论文作者
论文摘要
拓扑旋转结构（例如磁性天空），由于其固有的稳定性，对数据存储应用程序具有巨大的承诺。在大多数情况下，在表现出手性dzyaloshinskii-moriya交换相互作用的非中心对称系统中的磁场稳定了天际，而在具有长距离相互作用的Centrosymmmetric Storinerant磁铁中，已经据报道了自发的Skhyrmion Lattices。在这里，在半导体和中心对称金属卤化物NII $ _2 $的单层中预测了一个具有独特拓扑和手性的自发性抗杀伤力晶格。我们的第一原理和蒙特卡洛模拟表明，当短期对称交换与磁性挫败感结合使用时，可能导致出现的手性相互作用，该相互作用负责预测的拓扑旋转结构。所提出的机制在二维磁铁中发现了一种典型的表现，从而扩大了可以托管自发的天空状态的材料类别。
Topological spin structures, such as magnetic skyrmions, hold great promises for data storage applications, thanks to their inherent stability. In most cases, skyrmions are stabilized by magnetic fields in non-centrosymmetric systems displaying the chiral Dzyaloshinskii-Moriya exchange interaction, while spontaneous skyrmion lattices have been reported in centrosymmetric itinerant magnets with long-range interactions. Here, a spontaneous anti-biskyrmion lattice with unique topology and chirality is predicted in the monolayer of a semiconducting and centrosymmetric metal halide, NiI$_2$. Our first-principles and Monte Carlo simulations reveal that the anisotropies of the short-range symmetric exchange, when combined with magnetic frustration, can lead to an emergent chiral interaction that is responsible for the predicted topological spin structures. The proposed mechanism finds a prototypical manifestation in two-dimensional magnets, thus broadening the class of materials that can host spontaneous skyrmionic states.
