We report differential phase contrast scanning transmission electron microscopy (TEM) of nanoscale magnetic objects in Kagome ferromagnet Fe₃Sn₂ nanostructures. This technique can directly detect the deflection angle of a focused electron beam, thus allowing clear identification of the real magnetic structures of two magnetic objects including three-ring and complex arch-shaped vortices in Fe₃Sn₂ by Lorentz-TEM imaging. Numerical calculations based on real material-specific parameters well reproduced the experimental results, showing that the magnetic objects can be attributed to integral magnetizations of two types of complex three-dimensional (3D) magnetic bubbles with depth-modulated spin twisting. Magnetic configurations obtained using the high-resolution TEM are generally considered as two-dimensional (2D) magnetic objects previously. Our results imply the importance of the integral magnetizations of underestimated 3D magnetic structures in 2D TEM magnetic characterizations.

中文翻译：

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Fe3Sn2纳米结构中三维磁泡的二维表征

我们报告了 Kagome 铁磁体 Fe ₃ Sn ₂纳米结构中纳米级磁性物体的微分相衬扫描透射电子显微镜 (TEM) 。该技术可以直接检测聚焦电子束的偏转角，从而可以清楚地识别Fe ₃ Sn _{2 中}包括三环和复杂拱形涡旋在内的两个磁性物体的真实磁性结构。通过洛伦兹-TEM 成像。基于真实材料特定参数的数值计算很好地再现了实验结果，表明磁性物体可归因于两种复杂的三维 (3D) 磁泡具有深度调制的自旋扭曲的积分磁化。使用高分辨率 TEM 获得的磁性配置以前通常被认为是二维 (2D) 磁性对象。我们的结果暗示了在 2D TEM 磁表征中被低估的 3D 磁结构的积分磁化强度的重要性。