Two-dimensional characterization of three-dimensional magnetic bubbles in Fe_(3)Sn_(2) nanostructures  

作　　者：Jin Tang Yaodong Wu Lingyao Kong Weiwei Wang Yutao Chen Yihao Wang Y.Soh Yimin Xiong Mingliang Tian Haifeng Du 

机构地区：[1]Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,and University of Science and Technology of China,Hefei 230031,China [2]Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province,Hefei Normal University,Hefei 230601,China [3]School of Physics and Materials Science,Anhui University,Hefei 230601,China [4]Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China [5]Paul Scherrer Institute,5232 Villigen,Switzerland

出　　处：《National Science Review》2021年第6期182-188,共7页国家科学评论（英文版）

基　　金：This work was supported by the National Key Research and Development Program of China(2017YFA0303201);the Key Research Program of Frontier Sciences;Chinese Academy of Sciences(QYZDB-SSW-SLH009);the National Natural Science Foundation of China(11804343,11974021 and U1432138);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB33030100);the Equipment Development Project of Chinese Academy of Sciences(YJKYYQ20180012);Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province(2019GDTC06);Anhui Province Key Laboratory of Simulation and Design for Electronic Information System(2019ZDSYSZY04)。

摘　　要：We report differential phase contrast scanning transmission electron microscopy(TEM) of nanoscale magnetic objects in Kagome ferromagnet Fe_(3)Sn_(2) 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_(3)Sn_(2) 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.

关 键 词：SKYRMION skyrmion bubbles three-dimensional magnetic structures differential phase contrast scanning transmission electron microscopy MICROMAGNETICS 

分 类 号：TM228[一般工业技术—材料科学与工程]