Phase engineering of Cr₅Te₈ with colossal anomalous Hall effect

• Main Authors: Tang, Bijun, Wang, Xiaowei, Han, Mengjiao, Xu, Xiaodong, Zhang, Zhaowei, Zhu, Chao, Cao, Xun, Yang, Yumeng, Fu, Qundong, Yang, Jianqun, Li, Xingji, Gao, Weibo, Zhou, Jiadong, Lin, Junhao, Liu, Zheng
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Materials::Magnetic materials; Engineering::Materials::Microelectronics and semiconductor materials::Thin films; 2D Materials; Hall Effect
• Online Access: https://hdl.handle.net/10356/161710
• Institution: Nanyang Technological University

Two-dimensional materials that are intrinsically ferromagnetic are crucial for the development of compact spintronic devices. However, most non-layered 2D magnets with a strong ferromagnetic order are difficult to synthesize. Here we show that the flakes of trigonal and monoclinic Cr5Te8 can be grown via a chemical vapour deposition method. Using magneto-optical and magnetotransport measurements, we show that both phases exhibit robust ferromagnetism with strong perpendicular anisotropy at thicknesses of a few nanometres. A high Curie temperature of up to 200 K can be obtained by manipulating the phase structure and thickness. We also observe a colossal anomalous Hall effect in the more structurally distorted monoclinic Cr5Te8, with an anomalous Hall conductivity of 650 Ω−1 cm−1 and anomalous Hall angle of 5%.