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arXiv · 2311.17422

Sewing skyrmion and antiskyrmion by quadrupole of Bloch points

Jin Tang·Yaodong Wu·Jialiang Jiang·Lingyao Kong·Wei Liu·Shouguo Wang·Mingliang Tian·Haifeng Du
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Abstract

We report three-dimensional topological spin configurations including a novel form of skyrmion-antiskyrmion coupling in D2d chiral magnets. The skyrmion-antiskyrmion coupled string, consisting of skyrmions located in the near-surface layers and antiskyrmions in the interior of the nanostructured sample that are sewn together by emergent Bloch points, is a hybrid three-dimensional soliton solution resulting from the application of micromagnetic equations. We further provide experimental evidence of these 3D topological skyrmionic strings in a FeNiPdP chiral magnet with S4 symmetry. Our results demonstrate reversible topological magnetic transformations between skyrmion-antiskyrmion and skyrmion-bubble strings, which are mediated by the creation and annihilation of Bloch points.

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Jin Tang, Yaodong Wu, Jialiang Jiang, Lingyao Kong, Wei Liu, Shouguo Wang, Mingliang Tian, Haifeng Du. 2023-11-29. Sewing skyrmion and antiskyrmion by quadrupole of Bloch points. https://doi.org/10.1016/j.scib.2023.10.028

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