Progress and Prospects in Metallic Fe x GeTe2 (3 ≤ x ≤ 7) Ferromagnets

Hongtao Ren; Mu Lan

doi:10.3390/molecules28217244

Progress and Prospects in Metallic Fe _x GeTe₂ (3 ≤ x ≤ 7) Ferromagnets

Molecules. 2023 Oct 24;28(21):7244. doi: 10.3390/molecules28217244.

Authors

Hongtao Ren¹, Mu Lan²

Affiliations

¹ School of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China.
² College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu 610225, China.

Abstract

Thermal fluctuations in two-dimensional (2D) isotropy systems at non-zero finite temperatures can destroy the long-range (LR) magnetic order due to the mechanisms addressed in the Mermin-Wanger theory. However, the magnetic anisotropy related to spin-orbit coupling (SOC) may stabilize magnetic order in 2D systems. Very recently, 2D Fe_xGeTe₂ (3 ≤ x ≤ 7) with a high Curie temperature (T_C) has not only undergone significant developments in terms of synthetic methods and the control of ferromagnetism (FM), but is also being actively explored for applications in various devices. In this review, we introduce six experimental methods, ten ferromagnetic modulation strategies, and four spintronic devices for 2D Fe_xGeTe₂ materials. In summary, we outline the challenges and potential research directions in this field.

Keywords: Fe stoichiometry; Mermin-Wanger theory; doping engineering; electrical control; light control; magnetic skyrmions; patterning; spin-orbit torque; strain; twisting.

Publication types

Review

Grants and funding

ZR2021MA042/the Shandong Province Natural Science Foundation