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journal article·2020-06

Can Reconstructed Se‐Deficient Line Defects in Monolayer VSe2 Induce Magnetism?

Rebekah Chua, Jing Yang, Xiaoyue He, Xiaojiang Yu, Wei Yu, Fabio Bussolotti, Ping Kwan Johnny Wong, Kian Ping Loh, Mark B. H. Breese, Kuan Eng Johnson Goh, Yu Li Huang, Andrew T. S. Wee

Advanced Materials· Volume 32· Issue 24
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Source abstract

Abstract

Abstract There have been several recent conflicting reports on the ferromagnetism of clean monolayer VSe2. Herein, the controllable formation of 1D defect line patterns in vanadium diselenide (VSe2) monolayers initiated by thermal annealing is presented. Using scanning tunneling microscopy and q‐plus atomic force microscopy techniques, the 1D line features are determined to be 8‐member‐ring arrays, formed via a Se deficient reconstruction process. The reconstructed VSe2 monolayer with Se‐deficient line defects displays room‐temperature ferromagnetism under X‐ray magnetic circular dichroism and magnetic force microscopy, consistent with the density functional theory calculations. This study possibly resolves the controversy on whether ferromagnetism is intrinsic in monolayer VSe2, and highlights the importance of controlling and understanding the atomic structures of surface defects in 2D crystals, which could play key roles in the material properties and hence potential device applications.
Source: crossref · Quality: baseline

Research context

Materials processing

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Topological Materials and Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

NUS Graduate School for Integrative Sciences & Engineering (NGS) University Hall Tan Chin Tuan Wing 21 Lower Kent Ridge Singapore 119077 Singapore

Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

Institute of High Performance Computing Agency for Science Technology and Research 1 Fusionopolis Way, #16‐16 Connexis Singapore 138632 Singapore

Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China

Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore 117603 Singapore

Department of Chemistry National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

Institute of Materials Research & Engineering (IMRE) A*STAR (Agency for Science, Technology, and Research) 2 Fusionopolis Way, Innovis Singapore 138634 Singapore

Centre for Advanced 2D Materials National University of Singapore Block S14, Level 6, 6 Science Drive 2 Singapore 117546 Singapore

Funding

Agency for Science, Technology and Research · Ministry of Education - Singapore

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