Emergent ferromagnetism and unusual irreversible magnetoresistance in an intercalated van der Waals antiferromagnet

• 成果类型: Article
• 署名作者: Zhai, Zixin; Liu, Wenhao; Guo, Xiaoyu; Schulze, Daniel J.; Kuo, Ting -Wei; Agarwal, Nishkarsh; Stangel, Alex; Joshi, Pramanand; Liu, J. Ping; Deng, Liangzi; Hovden, Robert; Zhao, Liuyan; Chu, Ching -Wu; Lv, Bing
• 署名单位: University of Texas System; University of Texas Dallas; University of Michigan System; University of Michigan; University of Houston System; University of Houston; University of Houston System; University of Houston; University of Michigan System; University of Michigan; University of Michigan System; University of Michigan; University of Texas System; University of Texas Arlington
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.2527293123
• 发表日期: 2026-01-27
• 页码: e2527293123
• 关键词: two-dimensional magnets; chemical intercalations; irreversible magnetoresistance; OXYHALIDES; molecules

摘要

Orthorhombic air-stable two-dimensional (2D) antiferromagnet (AFM) CrSBr has attracted much research interest lately thanks to its rich magnetic behaviors together with its remarkable electronic, excitonic, and polaritonic properties. Here, we report a reliable electrochemical intercalation method by inserting large tetrabutylammonium (TBA+) ions into CrSBr layers. Magnetically, such intercalation efficiently suppresses the interlayer AFM and induces a ferromagnetic (FM) order with a much-enhanced transition temperature up to 200 K, nearly 70 K higher than the AFM onset of 132 K in pristine CrSBr. Electronically, the TBA+ intercalation not only increases the electric conductivity of CrSBr, which is further enhanced by magnetic fields, but also introduces a giant negative irreversible magnetoresistance. This work demonstrates the tunable magnetic and electronic properties of CrSBr as well as their interplay, paving the way for advanced spintronic and magnetic memory devices.