Magnetic skyrmions are topologically nontrivial spin configurations that possess particle‐like properties. Earlier research has mainly focused on a specific type of skyrmion with topological charge Q = −1. However, theoretical analyses of 2D chiral magnets have predicted the existence of skyrmion bags—solitons with arbitrary positive or negative topological charge. Although such spin textures are metastable states, recent experimental observations have confirmed the stability of isolated skyrmion bags in a limited range of applied magnetic fields. Here, by utilizing Lorentz transmission electron microscopy, the extraordinary stability of skyrmion bags in thin plates of B20‐type FeGe is shown. In particular, it is shown that skyrmion bags embedded within a skyrmion lattice remain stable even in zero or inverted external magnetic fields. A robust protocol for nucleating such embedded skyrmion bags is provided. The results agree perfectly with micromagnetic simulations and establish thin plates of cubic chiral magnets as a powerful platform for exploring a broad spectrum of topological magnetic solitons.

中文翻译：

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手性磁体薄膜中嵌入斯格明子袋


磁性斯格明子是拓扑上非平凡的自旋构型，具有类粒子特性。早期的研究主要集中在拓扑电荷 Q = −1 的特定类型的斯格明子上。然而，二维手性磁体的理论分析预测了斯格明子袋的存在，即具有任意正或负拓扑电荷的孤子。尽管这种自旋结构是亚稳态，但最近的实验观察已经证实了孤立的斯格明子袋在有限的施加磁场范围内的稳定性。在这里，通过利用洛伦兹透射电子显微镜，显示了 B20 型 FeGe 薄板中斯格明子袋的非凡稳定性。特别是，研究表明，嵌入斯格明子晶格内的斯格明子袋即使在零或反向外部磁场中也能保持稳定。提供了用于使此类嵌入的斯格明子袋成核的稳健协议。结果与微磁模拟完全一致，并将立方手性磁体薄板建立为探索广谱拓扑磁孤子的强大平台。