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Room‐Temperature Ferromagnetic Silver Vanadium Oxide (Ag 1.2 V 3 O 8 ): A Magnetic Semiconductor Nanoring Structure
Author(s) -
Wu Changzheng,
Zhu Haiou,
Dai Jun,
Yan Wensheng,
Yang Jinlong,
Tian Yangchao,
Wei Shiqiang,
Xie Yi
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201001179
Subject(s) - nanoring , materials science , ferromagnetism , spintronics , condensed matter physics , magnetic semiconductor , semiconductor , nanotechnology , optoelectronics , physics
Magnetic nanoring structures are attractive for spintronic devices due to their unique attributes of well‐defined and reproducible magnetic states originating from their characteristic geometry. Almost all previous magnetic nanorings have been exclusively limited to traditional ferromagnetic materials, and a magnetic semiconductor (MSC) nanoring structure has been reported rarely during the past decades. Here, it is demonstrated that room‐temperature ferromagnetic Ag 1.2 V 3 O 8 nanobelts and nanorings may be achieved by controlled oxidation of the V 4+ precursors in an Ag + ‐containing aqueous solution. The polarization‐induced self‐coiling of in situ formed Ag 1.2 V 3 O 8 nanobelts is responsible for the formation of the perfectly circular nanoring geometry. The NEXAFS spectra and the density functional calculations clearly reveal that the electron transfer originates from the hybridization of the doped Ag + and V 4+ atoms, causing ordering of the magnetic moments that give rise to the intrinsic ferromagnetism of the Ag 1.2 V 3 O 8 structure.