Recently, observation of new topological magnetic structures represented by skyrmions is expected to provide new paths in constructing spintronic devices. In magnetic bubbles, although these are “ancient” cylinder domains, the type-I bubbles (renamed as skyrmion bubbles with the same topology as skyrmions) have remotivated general scientific interests. On using Lorentz transmission electron microscopy (Lorentz-TEM) to recognize magnetic bubbles in magnetic nanostructures, scientists observed some complex vortex-like magnetic structures beyond the traditional magnetic bubbles, which could be used as information carriers in emerging spintronic devices. Physical understanding of them, however, remains unclear. Recently, Tang et al. from High Magnetic Field Laboratory of Chinese Academy of Sciences clarified these complex vortex-like structures as depth-modulated three-dimensional (3-D) magnetic bubbles in a Kagome crystal Fe3Sn2.
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Source: Phys.org