Phase-controllable growth of ultrathin 2D magnetic FeTe crystals

Lixing Kang, Chen Ye, Xiaoxu Zhao, Xieyu Zhou, Junxiong Hu, Qiao Li, Dan Liu, Chandreyee Manas Das, Jiefu Yang, Dianyi Hu, Jieqiong Chen, Xun Cao, Yong Zhang, Manzhang Xu, Jun Di, Dan Tian, Pin Song, Govindan Kutty, Qingsheng Zeng, Qundong Fu, Ya Deng, Jiadong Zhou, Ariando Ariando, Feng Miao, Guo Hong, Yizhong Huang, Stephen J. Pennycook, Ken-Tye Yong (), Wei Ji (), Xiao Renshaw Wang () and Zheng Liu ()
Additional contact information
Lixing Kang: Nanyang Technological University
Chen Ye: Nanyang Technological University
Xiaoxu Zhao: National University of Singapore
Xieyu Zhou: Renmin University of China
Junxiong Hu: National University of Singapore
Qiao Li: Nanjing University
Dan Liu: University of Macau
Chandreyee Manas Das: Research Techno Plaza
Jiefu Yang: Nanyang Technological University
Dianyi Hu: Nanyang Technological University
Jieqiong Chen: Nanyang Technological University
Xun Cao: Nanyang Technological University
Yong Zhang: Nanyang Technological University
Manzhang Xu: Nanyang Technological University
Jun Di: Nanyang Technological University
Dan Tian: Nanyang Technological University
Pin Song: Nanyang Technological University
Govindan Kutty: Nanyang Technological University
Qingsheng Zeng: Nanyang Technological University
Qundong Fu: Nanyang Technological University
Ya Deng: Nanyang Technological University
Jiadong Zhou: Nanyang Technological University
Ariando Ariando: National University of Singapore
Feng Miao: Nanjing University
Guo Hong: University of Macau
Yizhong Huang: Nanyang Technological University
Stephen J. Pennycook: National University of Singapore
Ken-Tye Yong: Research Techno Plaza
Wei Ji: Renmin University of China
Xiao Renshaw Wang: Nanyang Technological University
Zheng Liu: Nanyang Technological University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Two-dimensional (2D) magnets with intrinsic ferromagnetic/antiferromagnetic (FM/AFM) ordering are highly desirable for future spintronic devices. However, the direct growth of their crystals is in its infancy. Here we report a chemical vapor deposition approach to controllably grow layered tetragonal and non-layered hexagonal FeTe nanoplates with their thicknesses down to 3.6 and 2.8 nm, respectively. Moreover, transport measurements reveal these obtained FeTe nanoflakes show a thickness-dependent magnetic transition. Antiferromagnetic tetragonal FeTe with the Néel temperature (TN) gradually decreases from 70 to 45 K as the thickness declines from 32 to 5 nm. And ferromagnetic hexagonal FeTe is accompanied by a drop of the Curie temperature (TC) from 220 K (30 nm) to 170 K (4 nm). Theoretical calculations indicate that the ferromagnetic order in hexagonal FeTe is originated from its concomitant lattice distortion and Stoner instability. This study highlights its potential applications in future spintronic devices.

Date: 2020
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DOI: 10.1038/s41467-020-17253-x

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