From Stoner to local moment magnetism in atomically thin Cr2Te3

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

doi:10.1038/s41467-023-40997-1

From Stoner to local moment magnetism in atomically thin Cr2Te3

Journal Article · Sat Sep 02 00:00:00 UTC 2023 · Nature Communications

DOI:https://doi.org/10.1038/s41467-023-40997-1· OSTI ID:1997876

; Peng, Cheng; Huang, Haili; ; Hwang, Jinwoong; Hsu, Kuan H.; ; Jia, Chunjing; Moritz, Brian; ; ; ; ; ;

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 Cr ₂ Te ₃ 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 Cr ₂ Te ₃ 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 Cr ₂ Te ₃ as an excellent platform to explore the dual nature of localized and itinerant ferromagnetism in 2D magnets.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: Ministry of Science and Technology of China; Science and Technology Commission of Shanghai Municipality (STCSM); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; SC0022216

OSTI ID:: 1997876

Alternate ID(s):: OSTI ID: 2315619
OSTI ID: 2000751

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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