Title: Probing Random-Bond Disorder Effects on Ferromagnetic Skyrmion Arrays Show Chinese title

Title: 研究随机键无序效应对铁磁斯格明子阵列的影响

Abstract: In this work, we examined the impact of disorder in a ferromagnetic skyrmion lattice by introducing random-bond disorder based on two different models for both exchange and Dzyaloshinskii-Moriya interactions: Model I, where both interactions present the same disorder distribution and thus the same local distortion, and Model II, where both interactions have different disorder distributions. Through extensive Monte Carlo simulations, we explored the effect of bond disorder on the emergent phases induced by an external magnetic field at different temperatures, varying the disorder amplitude across a range from weak (10%) to strong (200%) regimes. Our study shows that for both models, moderate disorder at low magnetic fields breaks the helical order and induces a topologically non-trivial bimeron phase. We also found that the skyrmion lattice phase loses its periodicity, but surprisingly, the resulting phases retain topological characteristics up to high disorder amplitudes. Moreover, a significant difference between both disorder models is found at large magnetic fields: while in the first model, the high-field skyrmion phase is suppressed by disorder, in the second model, this phase is enhanced and expanded in temperature and magnetic field. Furthermore, for the second model, intermediate values of disorder induce a diluted skyrmion phase and chiral textures emerging from the ferromagnetic phase at low temperatures. Our results are relevant for layered magnets and provide valuable insights into the intricate behavior of skyrmion systems under varying disorder conditions. Show Chinese abstract

Abstract: 在这项工作中，我们通过引入基于两种不同模型的随机键无序来研究铁磁斯格明子晶格中无序的影响，这两种模型分别适用于交换相互作用和Dzyaloshinskii-Moriya相互作用：模型I，其中两种相互作用具有相同的无序分布，因此具有相同的局部畸变；模型II，其中两种相互作用具有不同的无序分布。 通过广泛的蒙特卡洛模拟，我们在不同温度下探索了键无序对外部磁场诱导的新兴相态的影响，在弱（10%）到强（200%）无序范围内变化无序幅度。 我们的研究表明，对于两种模型，在低磁场下适度的无序破坏了螺旋序并诱导了一个拓扑非平凡的双聚体相。 我们还发现，斯格明子晶格相失去了周期性，但令人惊讶的是，所产生的相态在高达高无序幅值时仍保留拓扑特性。 此外，在大磁场下发现了两种无序模型之间的显著差异：在第一个模型中，高场斯格明子相被无序抑制，而在第二个模型中，此相被增强并在温度和磁场范围内扩展。 此外，对于第二个模型，适度的无序在低温下诱导了一种稀疏的斯格明子相以及从铁磁相中出现的手性纹理。 我们的结果与层状磁体相关，并为理解斯格明子系统在不同无序条件下的复杂行为提供了宝贵的见解。