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Two-dimensional characterization of three-dimensional magnetic bubbles in Fe3Sn2 nanostructures.

ABSTRACT: 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.

SUBMITTER: Tang J 

PROVIDER: S-EPMC8288175 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature

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Two-dimensional characterization of three-dimensional magnetic bubbles in Fe<sub>3</sub>Sn<sub>2</sub> nanostructures.

Tang Jin J   Wu Yaodong Y   Kong Lingyao L   Wang Weiwei W   Chen Yutao Y   Wang Yihao Y   Soh Y Y   Xiong Yimin Y   Tian Mingliang M   Du Haifeng H  

National science review 20200828 6

We report differential phase contrast scanning transmission electron microscopy (TEM) of nanoscale magnetic objects in Kagome ferromagnet Fe<sub>3</sub>Sn<sub>2</sub> 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 Fe<sub>3</sub>Sn<sub>2</sub> by Lorentz-TEM imaging. Numerical calculations based on  ...[more]