Abstract
The heat treatment of nanoparticles can have a direct effect on their particle sizes, which, in turn, can influence many of their structural and magnetic properties. Here, we report the effect of sintering temperature on the chemically synthesized high-quality NiFe2O4 nanoparticles. The structural studies show the formation of pure NiFe2O4 nanoparticles with the space group \( Fd{\bar{\text{3}}}m \). The inverse spinel structure was also confirmed from the lattice vibrations analyzed from Raman and Fourier transform infrared spectroscopy (FTIR) spectra. The presence of strong exchange interactions was detected from the temperature-dependent magnetization study. Moreover, at higher sintering temperatures, the grain growth due to fusion of several smaller particles by coalescing their surfaces enhances the crystallinity and its magnetocrystalline anisotropy. Coercivity and saturation magnetization were found to depend significantly on the sintering temperature, which was understood in the realm of the formation of single-domain-like structure and change in magnetocrystalline anisotropy at higher sintering temperatures.
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Acknowledgments
The authors are thankful to Dr. Alok Banerjee, Scientist, UGC-DAE (Indore, India), for providing the SQUID facility and discussing the ZFC–FC results. The authors are also thankful to Mr. Debraj Gangopadhyay for helping with the Raman measurement and for discussing the Raman results.
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Ghosh, S., Patel, P.C., Gangopadhyay, D. et al. Structural and Magnetic Studies of Thermally Treated NiFe2O4 Nanoparticles. Metall Mater Trans A 48, 6135–6141 (2017). https://doi.org/10.1007/s11661-017-4344-y
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DOI: https://doi.org/10.1007/s11661-017-4344-y