"Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticl" by Pavana S. V. Mocherla, C. Karthik et al.
 

Effect of Microstrain on the Magnetic Properties of BiFeO3 Nanoparticles

Document Type

Article

Publication Date

9-29-2014

Abstract

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. Themagnetization 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.

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