Abstract Two-dimensional van der Waals ferromagnet FeGeTe (FGT) holds a great potential for applications in spintronic devices due to its high Curie temperature, easy tunability, and excellent structural stability in air. Theoretical studies have shown that pressure, as an external parameter, significantly affects its ferromagnetic properties. In this study, we have performed comprehensive high-pressure neutron powder diffraction (NPD) experiments on FGT up to 5 GPa to investigate the evolution of its structural and magnetic properties with hydrostatic pressure. The NPD data clearly reveal the robustness of the ferromagnetism in FGT, despite of an apparent suppression by hydrostatic pressure. As the pressure increases from 0 to 5 GPa, the Curie temperature is found to decrease monotonically from 225(5) K to 175(5) K, together with a dramatically suppressed ordered moment of Fe, which is well supported by the first-principles calculations. Although no pressure-driven structural phase transition is observed up to 5 GPa, quantitative analysis on the changes of bond lengths and bond angles indicates a significant modification of the exchange interactions, which accounts for the pressure-induced suppression of the ferromagnetism in FGT.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12074023), the Large Scientific Facility Open Subject of Songshan Lake (Grant No. KFKT2022B05), and the Fundamental Research Funds for the Central Universities in China. Neutron diffraction experiments at the Materials and Life Science Experimental Facility of the J-PARC were performed through the user program (Proposal No. 2023A0185).
Corresponding Authors:
Wentao Jin
E-mail: wtjin@buaa.edu.cn
Cite this article:
Yonglin Wang(王涌霖), Xu-Tao Zeng(曾旭涛), Bo Li(李博), Cheng Su(宿程), Takanori Hattori, Xian-Lei Sheng(胜献雷), and Wentao Jin(金文涛) Robustness of ferromagnetism in van der Waals magnet Fe3GeTe2 to hydrostatic pressure 2025 Chin. Phys. B 34 046203
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