物理学报2024，Vol.73Issue(1)：273-284,12.DOI:10.7498/aps.73.20231612
磁畴壁拓扑结构研究进展
Research progress in the magnetic domain wall topology
摘要
Abstract
Topological magnetic skyrmions,as information units,possess distinct advantages such as high reliability,enhanced integration,and low energy consumption.These novel topological characteristics offer critical material and technological support for the rapid development of information technology,5G communication,and big data.However,the application of magnetic skyrmions in practical devices is severely impeded by certain limitations,including their stability dependence on magnetic field and the deflection caused by the skyrmion Hall effect under electric current.Consequently,exploring new topological magnetic domain structures and material systems suitable for application becomes a pivotal area of research.This paper primarily focuses on experimental studies utilizing high-resolution Lorentz transmission electron microscopy for in situ real-space observation and manipulation of topological merons and skyrmions inside the magnetic domain wall,confirming the theoretical prediction of magnetic domain wall skyrmions in 2013.We has firstly achieved topological meron chains inside the domain walls by using the spin reorientation transition in two-dimensional van der Waals Fe5-xGeTe2 magnets,and systematically studied the dynamic behavior of domain wall topological magnetic domain structures under external electric and magnetic fields,filling the blanks in this research area.The important and special roles of magnetic domain walls are revealed at the same time.Then the GdFeCo amorphous ferrimagnetic thin film was designed and prepared based on the summarized mechanism with the domain wall meron pairs successfully reproduced.Moreover,the reversible topological transformation from domain wall meron pair to domain wall skyrmions has also been realized without external magnetic field during spin reorientation transformation as temperature changing.The results of micromagnetic simulation and electric experiments on the topological domains in domain walls would provided a strong basis and support for the future research.关键词
磁畴壁麦纫/磁畴壁斯格明子/自旋重取向/洛伦兹透射电子显微镜/二维磁性材料Key words
magnetic domain wall meron/magnetic domain wall skyrmion/spin reorientation transition/Lorentz transmission electron microscopy/two-dimensional magnet引用本文复制引用
张颖,李卓霖,沈保根..磁畴壁拓扑结构研究进展[J].物理学报,2024,73(1):273-284,12.基金项目
中国科学院先导计划(批准号:XDB33030100)、国家自然科学基金科学中心(批准号:52088101)、国家自然科学基金(批准号:52271195,52130103)和中国科学院稳定支持基础研究领域青年团队计划(批准号:YSBR-084)资助的课题.Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences,China(Grant No.XDB33030100),the Science Centre of the National Science Foundation of China(Grant No.52088101),the National Natural Science Foundation of China(Grant Nos.52271195,52130103),and the Project for Young Scientists in Basic Research of the Chinese Academy of Sciences,China(Grant No.YSBR-084). （批准号:XDB33030100）
