Magnetic Domain Structure in Ferromagnetic Kagome Metal DyMn6Sn6
Zhaohui Chen, Miao Li, Caixing Liu, Zongwei Ma, Yuyan Han, Jian-Hua Gao, Wensen Wei, Zhigao Sheng, Haifeng Du
Abstract
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 6 Sn 6 by microscopic magneto-optic Kerr imaging technique. From 255 to 235 K, the spin reorientation is observed directly in DyMn 6 Sn 6 . 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 6 Sn 6 is obtained.