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- Title
From Stoner to local moment magnetism in atomically thin Cr<sub>2</sub>Te<sub>3</sub>.
- Authors
Zhong, Yong; Peng, Cheng; Huang, Haili; Guan, Dandan; Hwang, Jinwoong; Hsu, Kuan H.; Hu, Yi; Jia, Chunjing; Moritz, Brian; Lu, Donghui; Lee, Jun-Sik; Jia, Jin-Feng; Devereaux, Thomas P.; Mo, Sung-Kwan; Shen, Zhi-Xun
- Abstract
The field of two-dimensional (2D) ferromagnetism has been proliferating over the past few years, with ongoing interests in basic science and potential applications in spintronic technology. However, a high-resolution spectroscopic study of the 2D ferromagnet is still lacking due to the small size and air sensitivity of the exfoliated nanoflakes. Here, we report a thickness-dependent ferromagnetism in epitaxially grown Cr2Te3 thin films and investigate the evolution of the underlying electronic structure by synergistic angle-resolved photoemission spectroscopy, scanning tunneling microscopy, x-ray absorption spectroscopy, and first-principle calculations. A conspicuous ferromagnetic transition from Stoner to Heisenberg-type is directly observed in the atomically thin limit, indicating that dimensionality is a powerful tuning knob to manipulate the novel properties of 2D magnetism. Monolayer Cr2Te3 retains robust ferromagnetism, but with a suppressed Curie temperature, due to the drastic drop in the density of states near the Fermi level. Our results establish atomically thin Cr2Te3 as an excellent platform to explore the dual nature of localized and itinerant ferromagnetism in 2D magnets. Over the last few years, several van der Waals materials have been found that retain magnetic ordering down to monolayer thickness. These materials provide a simple platform for studying the magnetism in reduced dimensions. Here, Zhong et al study the thickness dependence of magnetic ordering in Cr2Te3, and find a crossover from Stoner to Heisenberg-type magnetism as thicknesses are reduced.
- Subjects
PHOTOEMISSION; MAGNETISM; SCANNING tunneling microscopy; X-ray absorption; PHOTOELECTRON spectroscopy; FERMI level; FERROMAGNETISM
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-40997-1