Goswami, Sudipta and Bhattacharya, Dipten and Choudhury, Pranab
(2011)
Particle size dependence of magnetization and noncentrosymmetry in nanoscale BiFeO(3).
Journal of Applied Physics, 109 (7).
Article Number:- 07D737 .
ISSN 0021-8979
Abstract
The saturation magnetization (M(S)), antiferromagnetic transition point (T(N)), and the off-center displacements of Bi and Fe ions have been measured as a function of particle size in nanoscale BiFeO(3). TN decreases down to similar to 550 K for particles of size similar to 5 nm from similar to 653 K in bulk, while MS rises by more than an order of magnitude. Analysis of crystallographic structure from Rietveld refinement of x-ray diffraction patterns shows significant rise in off-center displacements of Bi (delta(Bi)) and Fe (delta(Fe)) ions within a unit cell with the decrease in particle size. The net unit-cell polarization PS too, is found to be larger in nanoscale regime. (c) 2011 American Institute of Physics. [doi: 10.1063/1.3567038]
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