Observation of stacking engineered magnetic phase transitions within moiré supercells of twisted van der Waals magnets

Li, Senlei; Sun, Zeliang; McLaughlin, Nathan J.; Sharmin, Afsana; Agarwal, Nishkarsh; Huang, Mengqi; Sung, Suk Hyun; Lu, Hanyi; Yan, Shaohua; Lei, Hechang; Hovden, Robert; Wang, Hailong; Chen, Hua; Zhao, Liuyan; Du, Chunhui Rita

doi:10.1038/s41467-024-49942-2

Title: Observation of stacking engineered magnetic phase transitions within moiré supercells of twisted van der Waals magnets

Journal Article · 08 July 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-49942-2 · OSTI ID:2396018

Li, Senlei; Sun, Zeliang; McLaughlin, Nathan J.; Sharmin, Afsana;

; Huang, Mengqi;

; Lu, Hanyi; Yan, Shaohua;

;

Abstract Recent demonstrations of moiré magnetism, featuring exotic phases with noncollinear spin order in the twisted van der Waals (vdW) magnet chromium triiodide CrI ₃ , have highlighted the potential of twist engineering of magnetic (vdW) materials. However, the local magnetic interactions, spin dynamics, and magnetic phase transitions within and across individual moiré supercells remain elusive. Taking advantage of a scanning single-spin magnetometry platform, here we report observation of two distinct magnetic phase transitions with separate critical temperatures within a moiré supercell of small-angle twisted double trilayer CrI ₃ . By measuring temperature-dependent spin fluctuations at the coexisting ferromagnetic and antiferromagnetic regions in twisted CrI ₃ , we explicitly show that the Curie temperature of the ferromagnetic state is higher than the Néel temperature of the antiferromagnetic one by ~10 K. Our mean-field calculations attribute such a spatial and thermodynamic phase separation to the stacking order modulated interlayer exchange coupling at the twisted interface of moiré superlattices.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0022946

OSTI ID:: 2396018

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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