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Simultaneous reduction in leakage current and enhancement in magnetic moment in BiFeO 3 nanofibers via optimized Sn doping
Author(s) -
Yang Qian,
Xu Qiang,
Sobhan Mushtaq,
Ke Qingqing,
Anariba Franklin,
Ong Khuong P.,
Wu Ping
Publication year - 2014
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201409043
Subject(s) - materials science , nanofiber , doping , magnetic moment , electrospinning , density functional theory , impurity , condensed matter physics , current density , nanotechnology , magnetization , leakage (economics) , optoelectronics , magnetic field , composite material , computational chemistry , chemistry , physics , organic chemistry , quantum mechanics , economics , macroeconomics , polymer
Sn 4+ ‐doped BiFeO 3 (BFO) nanofibers have been fabricated by sol–gel based electrospinning method with nanofiber diameter in the range of 30–100 nm in the annealed state. The leakage current density dropped by two orders of magnitude in 3% Sn‐doped BFO nanofibers compared to undoped BFO samples. Our density functional theory (DFT) simulation results indicate that Sn 4+ prefers to occupy the Fe 3+ site in BFO with a formation energy of 1.89 eV. The impurity Sn acts as a shallow donor with a low transition energy level of 41 meV. Furthermore, an enhancement in the saturation magnetization was simultaneously observed for 3% Sn‐doped nanofibers, which correlated well with our theoretical calculations. In other words, by carefully tailoring the degree of Sn doping in BFO nanofibers, we can reduce the leakage current and concurrently enhance the magnetic moment. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)