Title: The role of magnetic dipolar interactions in skyrmion lattices Show Chinese title

Title: 磁偶极相互作用在自旋磁体晶格中的作用

Abstract: Magnetic skyrmions are promising candidates for information and storage technologies. In the last years, magnetic multilayer systems have been tuned to enable room-temperature skyrmions, stable even in the absence of external magnetic field. There are several models describing the properties of an isolated skyrmion in a homogeneous background for single repetition multilayer stack, however, the description on how the equilibrium skyrmion size in lattices scales with increasing the number of repetitions of the stack remains unaddressed. This question is essential for fundamental and practical perspectives, as the behaviour of an ensemble of skyrmions differs from the isolated case. Based on a multilayer stack hosting a skyrmion lattice, we have carried out a series of imaging experiments scaling up the dipolar interaction by repeating $n$ times the multilayer unit, from $n =1$ up to $n=30$. We have developed an analytical description for the skyrmion radius in the whole multilayer regime, $i.e.$, from thin to thick film limits. Furthermore, we provide insight on how nucleation by an externally applied field can give rise to a lattice with more skyrmions (thus, overfilled) than the predicted by the calculations. Show Chinese abstract

Abstract: 磁性斯格明子是信息和存储技术的有前途的候选者。 在近几年，磁性多层系统已被调整以实现室温下的斯格明子，在没有外部磁场的情况下也能保持稳定。 有几个模型描述了单次重复多层堆栈中孤立斯格明子在均匀背景中的特性，然而，关于随着堆栈重复次数增加，晶格中平衡斯格明子尺寸如何变化的描述仍未被解决。 这个问题对于基础和实际观点都是至关重要的，因为斯格明子集合的行为与孤立情况不同。 基于一个包含斯格明子晶格的多层堆栈，我们进行了一系列成像实验，通过将多层单元重复$n$次来扩大偶极相互作用，从$n =1$到$n=30$。 我们开发了整个多层区域中斯格明子半径的解析描述，$i.e.$，从薄膜到厚膜极限。 此外，我们提供了关于如何通过外加磁场的引发可以产生比计算预测更多的斯格明子（即过填充）的晶格的见解。