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Effect of microstrain on the magnetic properties of BiFeO3 nanoparticles
Published in American Institute of Physics Inc.
Volume: 105
Issue: 13
We report on size induced microstrain-dependent magnetic properties of BiFeO3 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 FeO6 octahedral rotation for d < 65 nm. The magnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO3, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the TN with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO3. © 2014 AIP Publishing LLC.
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JournalData powered by TypesetApplied Physics Letters
PublisherData powered by TypesetAmerican Institute of Physics Inc.
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