Three‐Dimensional Magnetic Structures of B20 Chiral Magnets

Abstract

The study of magnetic skyrmions has been carried out for more than a decade since their discovery, and the magnetism community has witnessed tremendous advances in the idea of topological magnetism. The conventional way of describing a skyrmion is to simplify it as a two-dimensional object. However, recent advances in this field have emphasized that their three-dimensional structures are essential to be taken into account, in order to fully grasp the underlying physics of such a fascinating system. In this chapter, the authors review the recent theoretical and experimental advances in the topic of three-dimensional topological structures, and expect the prospective of this research field. Besides the skyrmion tube, magnetic bobbers could occur near the surface of chiral magnets. Comparing with the normal skyrmion tube, the finite penetration depth of bobbers results in a weak contrast when observed using the quantitative off-axis electron holography.