AUTHOR=Chen Zhaohui , Li Miao , Liu Caixing , Ma Zongwei , Han Yuyan , Gao Jianhua , Wei Wensen , Sheng Zhigao , Du Haifeng 

TITLE=Magnetic Domain Structure in Ferromagnetic Kagome Metal DyMn6Sn6

JOURNAL=Frontiers in Physics

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.685510

DOI=10.3389/fphy.2021.685510

ISSN=2296-424X

ABSTRACT=<p>Two types of magnetic domains, that is, type-I domain belt domain and type-II new stripe domain, are observed in a kagome metal DyMn<sub>6</sub>Sn<sub>6</sub> by microscopic magneto-optic Kerr imaging technique. From 255 to 235 K, the spin reorientation is observed directly in DyMn<sub>6</sub>Sn<sub>6</sub>. We analyze the structure of two types of domains through brightness distribution of the images. The type-II domain exists from 235 to 160 K by zero-field cooling (ZFC). At the same time, type-I domain and type-II domain coexist and transform into each other with variation of temperature. Type-II domains can easily transform into type-I domains when the temperature and magnetic field changes, and this process is irreversible. These results demonstrate that the type-I domain is more stable than the type-II domain. The phase diagram of magnetic domains in DyMn<sub>6</sub>Sn<sub>6</sub> is obtained.</p>