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Title: Room-temperature ferromagnetism properties of monoclinic VO{sub 2} (M1) nanobelts

Highlights: • The unusual room temperature ferromagnetism of the VO{sub 2}(M1) nanobelts is found in magnetic measurement. • The oxygen vacancies induce the change of Bader charge of V atom from +2.34 to +1.84 (V{sup +4} to V{sup +3}). • The ferromagnetic nature is a result of the oxygen vacancies based on the calculations by DFT. - Abstract: The magnetic properties of monoclinic VO{sub 2}(M1) nanobelts synthesized by the hydrothermal method are investigated. The VO{sub 2}(M1) nanobelts exhibit ferromagnetism at room temperature, which disagrees with previous literatures. The excessive oxygen vacancies induce the ferromagnetic nature of VO{sub 2}(B) nanobelts, which is attributed to the fact that the Bader charge of V atom changes from +2.34 to +1.84 (V{sup +4} to V{sup +3}) based on the calculations by using density functional theory (DFT). The calculations indicate that oxygen vacancy may induce the presence of V{sup 3+} atom, in agreement with experimental observations. The observed ferromagnetism should be a result of oxygen vacancies in VO{sub 2}(M1) nanobelts.
Authors:
 [1] ;  [1] ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Department of Applied Physics, Chongqing University, Chongqing, 400044 (China)
  2. (China)
  3. Key Lab Optoelect Funt Mat Chongqing, Chongqing, 400047 (China)
Publication Date:
OSTI Identifier:
22348636
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 53; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; DENSITY FUNCTIONAL METHOD; ELECTRONIC STRUCTURE; FERROMAGNETISM; HYDROTHERMAL SYNTHESIS; MAGNETIC PROPERTIES; MONOCLINIC LATTICES; NANOSTRUCTURES; OXYGEN; VANADIUM IONS; VANADIUM OXIDES; X-RAY DIFFRACTION