Fig. MOKE measurements of Cr5Te8 single crystals. a) Hysteresis loops at different temperatures (10-150 K) obtained from a Cr5Te8 nanosheet with a thickness of 15 nm. b) Hysteresis loops of Cr5Te8 nanosheets with thicknesses of 10, 17, 23, and 30 nm measured at 50 K. c)HC as a function of thickness. d) θK as a function of temperature for the four Cr5Te8 nanosheets. e) Thickness-temperature phase diagram of Cr5Te8 single crystals.
Background
2D materials have attracted considerable interest owing to their abundant structures and remarkable properties for fundamental study and potential technological applications. In recent years, the discovery of 2D ferromagnets has also provided an ideal platform for exploring and understanding magnetism in the ultimate 2D limit. To date, several 2D magnetic materials, such as CrI3, Cr2Ge2Te6, Fe3GeTe2 have been sequentially explored. However, the choice of presently available 2D magnetic materials is still quite limited, and most of them suffer from instability in the ambient atmosphere which inevitably hinders intrinsic magnetism explorations and practical applications. Hence, exploring new kinds of 2D magnetic materials with better stability are of considerable importance for further development of this field.
What is discovered?
We have successfully synthesized high-quality 2D Cr5Te8 nanosheets on mica substrate via a tube-in-tube CVD approach. MOKE measurements demonstrate that Cr5Te8 nanosheets are ferromagnets with TC up to 160 K. More importantly, the Cr5Te8 nanosheets exhibit an outstanding air stability, and their MOKE signal remains unchanged after three months of aging in air. The controllable synthesis of Cr5Te8 together with its outstanding and air-stable ferromagnetic property opens up new prospects for the study of 2D magnetism and spintronic device applications.
What is important?
Two-dimensional ferromagnets with high air stability and good growth controllability are of great importance for 2D magnetism and spintronic device applications. Cr5Te8 nanosheets demonstrated in this work exhibit an outstanding air stability and good growth controllability. Which may become a good candidate for investigations of 2D magnetism and spintronic devices.
Why did we need WHMFC?
MOKE is a powerful tool for investigation of 2D ferromagnetic materials. The lab-build MOKE setup in WHMFC provides a magnetic field of 0-2.5T, temperature range of 4.2-300K, and space resolution of 3 μm, and it played an important role in ferromagnetism characterizations in Cr5Te8 nanosheets of this work.
Who did the research?
Chao Chen, Xiaodie Chen, Changwei Wu, Xiao Wang,* Yue Ping,1 Xin Wei,1 Xing Zhou, Jiangbo Lu, Lujun Zhu, Jiadong Zhou, Tianyou Zhai, Junbo Han,* and Hua Xu*
C. Chen, Y. Ping, X. Wei, H. Xu Key
Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education) Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and Engineering Shaanxi Normal University Xi’an 710119, P. R. China E-mail:xuhua-nano@snnu.edu.cn
X. D. Chen, J. B. Han
Wuhan National High Magnetic Field Centre and Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China E-mail:junbo.han@mail.hust.edu.cn
C. W. Wu, X. Wang
Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences, Shenzhen, Guangdong 518055, P. R. China E-mail:xiao.wang@siat.ac.cn
X. Zhou, T. Y. Zhai
State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
J. B. Lu, J. L. Zhu
School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, P. R. China
J. D. Zhou
Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (Ministry of Education), School of Physics Beijing Institute of Technology Beijing 100081, P. R. China
Link
https://onlinelibrary.wiley.com/doi/10.1002/adma.202107512
