Origin of itinerant ferromagnetism in two-dimensional Fe3GeTe2

doi:10.1088/1674-1056/abd164

中国物理B ›› 2021, Vol. 30 ›› Issue (4): 47502-.doi: 10.1088/1674-1056/abd164

收稿日期:2020-09-21 修回日期:2020-11-30 接受日期:2020-12-08 出版日期:2021-03-16 发布日期:2021-03-24

Origin of itinerant ferromagnetism in two-dimensional Fe₃GeTe₂

Xi Chen(陈熙), Zheng-Zhe Lin(林正喆)^†, and Li-Rong Cheng(程丽蓉)

1 School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China

Received:2020-09-21 Revised:2020-11-30 Accepted:2020-12-08 Online:2021-03-16 Published:2021-03-24
Contact: ^†Corresponding author. E-mail: zzlin@xidian.edu.cn
Supported by:
Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. XJS200503) and the Post-Doctoral Research Project of Shaanxi Province, China.

摘要/Abstract

Abstract: Magnetic order in two-dimensional systems was not supposed to exist at finite temperature. In recent years, the successful preparation of two-dimensional ferromagnetic materials such as CrI₃, Cr₂Ge₂Te₆, and Fe₃GeTe₂ opens up a new chapter in the remarkable field of two-dimensional materials. Here, we report on a theoretical analysis of the stability of ferromagnetism in Fe₃GeTe₂. We uncover the mechanism of holding long-range magnetic order and propose a model to estimate the Curie temperature of Fe₃GeTe₂. Our results reveal the essential role of magnetic anisotropy in maintaining the magnetic order of two-dimensional systems. The theoretical method used here can be generalized to future research of other magnetic two-dimensional systems.

Key words: two-dimensional (2D) ferromagnetism, spin wave, magnetic anisotropy

中图分类号: (Magnetic properties of monolayers and thin films)

75.70.Ak

75.10.Jm (Quantized spin models, including quantum spin frustration)

. [J]. 中国物理B, 2021, 30(4): 47502-.

Xi Chen(陈熙), Zheng-Zhe Lin(林正喆), and Li-Rong Cheng(程丽蓉). Origin of itinerant ferromagnetism in two-dimensional Fe₃GeTe₂[J]. Chin. Phys. B, 2021, 30(4): 47502-.

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Origin of itinerant ferromagnetism in two-dimensional Fe₃GeTe₂

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