Even–Odd‐Layer‐Dependent Ferromagnetism in 2D Non‐van‐der‐Waals CrCuSe2. Issue 16 (8th March 2023)

• Record Type: Journal Article
• Authors: Peng, Jing; Su, Yueqi; Lv, Haifeng; Wu, Jiajing; Liu, Yuhua; Wang, Minghao; Zhao, Jiyin; Guo, Yuqiao; Wu, Xiaojun; Wu, Changzheng; Xie, Yi
• Is Part Of: Advanced materials. Volume 35:Issue 16(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-03-08
• Subjects: 2D materials -- anomalous Hall effect -- ferromagnetism -- interlayer interactions -- layer‐dependent properties; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202209365
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Van der Waals (vdW) layered materials with strong magnetocrystalline anisotropy have attracted significant interest as the long‐range magnetic order in these systems can survive even when their thicknesses is reduced to the 2D limit. Even though the interlayer coupling between the neighboring magnetic layers is very weak, it has a determining effect on the magnetism of these atomic‐thickness materials. Herein, a new 2D ferromagnetic material, namely, non‐vdW CuCrSe2 nanosheets with even–odd‐layer‐dependent ferromagnetism when laminated from an antiferromagnetic bulk is reported. Monolayer and even‐layer CuCrSe2 exhibit the anomalous Hall effect and a significantly enhanced magnetic ordering temperature of more than 125 K. In contrast, the linear Hall effect exists in the odd‐layer samples. Theoretical calculations indicate that the layer‐dependent magnetic coupling is attributable to the orbital shift of the Cr atoms in the CrSe2 layers owing to the Cu‐induced breaking of the centrosymmetry. Thus, this work sheds light on the exotic magnetic properties of layered materials that exhibit phenomena beyond weak interlayer interactions. Abstract : Non‐van‐der‐Waals 2D CuCrSe2 nanosheets with thickness down to monolayer are produced using a redox‐controlled exfoliation route. Differing from its bulk form with antiferromagnetic order, the CuCrSe2 nanosheets exhibit intriguing even–odd‐layer‐dependent magnetism evolution, which can be attributed to the orbital shift of Cr layers due to Cu‐induced centrosymmetry breaking.