We explore the skyrmion formation and control possibilities in two-dimensional (2D) magnets from the ubiquitous moiré pattern in vdW heterostructures. Using the example of a ferromagnetic monolayer on an antiferromagnetic substrate, we demonstrate a new origin of skyrmions in the 2D magnets from the lateral modulation of interlayer magnetic coupling by the locally different atomic registries in moiré. The moiré skyrmions are doubly degenerate with opposite topological charge and trapped at an ordered array of sites with the moiré periodicity that can be dramatically tuned by strain and interlayer translation. At relatively strong interlayer coupling, the ground states are skyrmion lattices, where magnetic field can switch the skyrmion vorticity and location in the moiré. At weak interlayer coupling limit, we find metastable skyrmion excitations on the ferromagnetic ground state that can be deterministically moved between the ordered moiré trapping sites by current pulses. Our results point to potential uses of moiré skyrmions both as information carriers and as drastically tunable topological background of electron transport.

中文翻译：

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范德华2D磁铁云纹中的Skyrmions

我们研究了vdW异质结构中普遍存在的莫尔条纹，在二维（2D）磁体中形成了Skyrmion，并控制了这种可能性。以反铁磁衬底上的铁磁单层为例，我们证明了莫尔层中不同原子登记处对层间磁耦合的横向调制，从而在2D磁体中出现了天体离子。摩尔云集天体离子以相反的拓扑电荷双重退化，并被困在具有一定摩尔纹周期性的有序排列的位点阵列中，该序列可以通过应变和层间平移而得到显着调整。在相对强的层间耦合下，基态是天rm子晶格，磁场可以在其中改变天rm子的涡度和在莫尔条纹中的位置。在薄弱的层间耦合极限下，我们发现在铁磁基态上的亚稳态skyrmion激发可以通过电流脉冲确定性地在有序的莫尔陷波位点之间移动。我们的研究结果表明，莫尔条纹的天体离子既可以用作信息载体，又可以用作电子传输的极大可调拓扑背景。