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Current-driven dynamics of skyrmion bubbles in achiral uniaxial magnets

Chinese Physics B 2022年第7期31卷 554-559页

作者： Yaodong Wu Jialiang Jiang Jin Tang School of Physics and Materials Engineering Hefei Normal UniversityHefei 230601China School of Physics and Optoelectronics Engineering Science Anhui UniversityHefei 230601China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China

We report dynamics of skyrmion bubbles driven by spin-transfer torque in achiral ferromagnetic nanostripes using micromagnetic *** a three-dimensional uniaxial ferromagnet with a quality factor that is smaller than 1,the skyrmion bubble is forced to stay at the central nanostripe by a repulsive force from the geometry *** coherent motion of skyrmion bubbles in the nanostripe can be realized by increasing the quality factor to~*** results should propel the design for future spintronic devices such as artificial neural computing and racetrack memory based on dipolestabilized skyrmion bubbles.

关键词： skyrmion bubbles dynamic motion artificial neural computing

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

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National Science Review 2021年第6期8卷 188-194页

作者： Jin Tang Yaodong Wu Lingyao Kong Weiwei Wang Yutao Chen Yihao Wang Y.Soh Yimin Xiong Mingliang Tian Haifeng Du Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciencesand University of Science and Technology of China Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province Hefei Normal University School of Physics and Materials Science Anhui University Institute of Physical Science and Information Technology Anhui University Paul Scherrer Institute

We report differential phase contrast scanning transmission electron microscopy(TEM) of nanoscale magnetic objects in Kagome ferromagnet Fe3 Sn2 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 Fe3 Sn2 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(3 D) magnetic bubbles with depth-modulated spin twisting. Magnetic configurations obtained using the high-resolution TEM are generally considered as two-dimensional(2 D)magnetic objects previously. Our results imply the importance of the integral magnetizations of underestimated 3 D magnetic structures in 2 D TEM magnetic characterizations.

关键词： skyrmion skyrmion bubbles three-dimensional magnetic structures differential phase contrast scanning transmission electron microscopy micromagnetics

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