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Can Reconstructed Se‐Deficient Line Defects in Monolayer VSe 2 Induce Magnetism?
Author(s) -
Chua Rebekah,
Yang Jing,
He Xiaoyue,
Yu Xiaojiang,
Yu Wei,
Bussolotti Fabio,
Wong Ping Kwan Johnny,
Loh Kian Ping,
Breese Mark B. H.,
Goh Kuan Eng Johnson,
Huang Yu Li,
Wee Andrew T. S.
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202000693
Subject(s) - monolayer , scanning tunneling microscope , materials science , magnetism , ferromagnetism , condensed matter physics , magnetic force microscope , annealing (glass) , density functional theory , magnetic circular dichroism , crystallography , microscopy , nanotechnology , chemical physics , magnetization , spectral line , optics , computational chemistry , chemistry , magnetic field , physics , composite material , quantum mechanics , astronomy
There have been several recent conflicting reports on the ferromagnetism of clean monolayer VSe 2 . Herein, the controllable formation of 1D defect line patterns in vanadium diselenide (VSe 2 ) 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 VSe 2 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 VSe 2 , 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.