Tang Jin, Kong Lingyao, Wu Yaodong, Wang Weiwei, Chen Yutao, Wang Yihao, Li Junbo, Soh Y, Xiong Yimin, Tian Mingliang, Du Haifeng
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of Chinese Academy of Sciences, and University of Science and Technology of China, Hefei, 230031, China.
School of Physics and Materials Science, Anhui University, Hefei, 230601, China.
ACS Nano. 2020 Sep 22;14(9):10986-10992. doi: 10.1021/acsnano.0c04036. Epub 2020 Aug 10.
We report a vortex-like magnetic configuration in uniaxial ferromagnet FeSn nanodisks using differential phase contrast scanning transmission electron microscopy. This magnetic configuration is transferred from a conventional magnetic vortex using a zero-magnetic-field warming process and is characterized by a series of concentric cylinder domains. We termed them as "target bubbles" that are identified as three-dimensional depth-modulated magnetic objects in combination with numerical simulations. Target bubbles have room-temperature stability even at zero magnetic field and multiple stable magnetic configurations. These advantages render the target bubble an ideal bit to be an information carrier and can advance magnetic target bubbles toward functionalities in the long term by incorporating emergent degrees of freedom and purely electrically controllable magnetism.
我们使用差分相衬扫描透射电子显微镜报告了单轴铁磁体FeSn纳米盘中的一种类似涡旋的磁结构。这种磁结构通过零磁场加热过程从传统磁涡旋转变而来，其特征是一系列同心圆柱畴。我们将它们称为“目标泡”，结合数值模拟将其识别为三维深度调制磁体。目标泡即使在零磁场下也具有室温稳定性和多种稳定磁结构。这些优点使目标泡成为理想的信息载体比特，并通过纳入新兴自由度和纯电可控磁性，从长远来看可以推动磁性目标泡实现更多功能。
