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Title: Effect of microstrain on the magnetic properties of BiFeO{sub 3} nanoparticles

We report on size induced microstrain-dependent magnetic properties of BiFeO{sub 3} nanoparticles. The microstrain is found to be high (ε > 0.3%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle size increases. The presence of pseudo-cubic symmetry is evidenced for these nanoparticles. Raman spectral studies suggest straightening of the Fe-O-Fe bond angle accompanied by a decrease in FeO{sub 6} octahedral rotation for d < 65 nm. The magnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO{sub 3}, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the T{sub N} with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO{sub 3}.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Multifunctional Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600036 (India)
  2. Department of Materials Science and Engineering, Boise State University, 1910 University Drive, Boise, Idaho 83725 (United States)
  3. Department of Physics and Nano Functional Materials Technology Centre, Indian Institute of Technology Madras, Chennai 600036 (India)
Publication Date:
OSTI Identifier:
22350806
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; BISMUTH COMPOUNDS; BOND ANGLE; FERRITES; MAGNETIC PROPERTIES; MAGNETIZATION; NANOPARTICLES; NEEL TEMPERATURE; PARTICLE SIZE; SPIN; SYMMETRY; TRIGONAL LATTICES