From Stoner to local moment magnetism in atomically thin Cr2Te3

Yong Zhong (), Cheng Peng, Haili Huang, Dandan Guan (), Jinwoong Hwang, Kuan H. Hsu, Yi Hu, Chunjing Jia, Brian Moritz, Donghui Lu, Jun-Sik Lee, Jin-Feng Jia, Thomas P. Devereaux, Sung-Kwan Mo () and Zhi-Xun Shen ()
Additional contact information
Yong Zhong: Lawrence Berkeley National Laboratory
Cheng Peng: SLAC National Accelerator Laboratory
Haili Huang: Shanghai Jiao Tong University
Dandan Guan: SLAC National Accelerator Laboratory
Jinwoong Hwang: Lawrence Berkeley National Laboratory
Kuan H. Hsu: Stanford University
Yi Hu: Stanford University
Chunjing Jia: SLAC National Accelerator Laboratory
Brian Moritz: SLAC National Accelerator Laboratory
Donghui Lu: SLAC National Accelerator Laboratory
Jun-Sik Lee: SLAC National Accelerator Laboratory
Jin-Feng Jia: Shanghai Jiao Tong University
Thomas P. Devereaux: SLAC National Accelerator Laboratory
Sung-Kwan Mo: Lawrence Berkeley National Laboratory
Zhi-Xun Shen: SLAC National Accelerator Laboratory

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-40997-1

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