Infrared imaging of magnetic octupole domains in non-collinear antiferromagnets  

作　　者：Peng Wang Wei Xia Jinhui Shen Yulong Chen Wenzhi Peng Jiachen Zhang Haolin Pan Xuhao Yu Zheng Liu Yang Gao Qian Niu Zhian Xu Hongtao Yang Yanfeng Guo Dazhi Hou 

机构地区：[1]International Center for Quantum Design of Functional Materials(ICQD),School of Emerging Technology,University of Science and Technology of China,Hefei 230026,China [2]College of Mathematics and Physics,Qingdao University of Science and Technology,Qingdao 266061,China [3]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [4]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China [5]Department of Physics,University of Science and Technology of China,Hefei 230026,China [6]CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics,University of Science and Technology of China,Hefei 230026,China [7]Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences,Xi’an 710119,China

出　　处：《National Science Review》2024年第6期190-198,共9页国家科学评论（英文版）

摘　　要：Magnetic structure plays a pivotal role in the functionality of antiferromagnets (AFMs), which not only canbe employed to encode digital data but also yields novel phenomena. Despite its growing significance,visualizing the antiferromagnetic domain structure remains a challenge, particularly for non-collinearAFMs. Currently, the observation of magnetic domains in non-collinear antiferromagnetic materials isfeasible only in Mn_(3)Sn, underscoring the limitations of existing techniques that necessitate distinct methodsfor in-plane and out-of-plane magnetic domain imaging. In this study, we present a versatile method forimaging the antiferromagnetic domain structure in a series of non-collinear antiferromagnetic materials byutilizing the anomalous Ettingshausen effect (AEE), which resolves both the magnetic octupole momentsparallel and perpendicular to the sample surface. Temperature modulation due to AEE originating fromdifferent magnetic domains is measured by lock-in thermography, revealing distinct behaviors of octupoledomains in different antiferromagnets. This work delivers an efficient technique for the visualization ofmagnetic domains in non-collinear AFMs, which enables comprehensive study of the magnetization processat the microscopic level and paves the way for potential advancements in applications.

关 键 词：non-collinear antiferromagnet domain structure infrared imaging anomalous Ettingshausen effect 

分 类 号：O469[理学—凝聚态物理]