Thermal-induced magnetic transition in CoFe2O4@ZnO

L. Herojit Singh, Sudhanshu S. Pati, A. C. Oliveira, Vijayendra K. Garg, E. Kuzmann

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Abstract

Composites of CoFe2O4 and ZnO (CFO@ZnO) nanomaterials were synthesized using double stage co-precipitation. The structural properties have been investigated by x-ray diffraction which shows the presence of hexagonal ZnO and spinel CoFe2O4. Variation in lattice parameters, after annealing at elevated temperature, indicates the diffusion of cations from the ZnO to CoFe2O4 and vice versa. Magnetic properties were measured by Mössbauer spectroscopy and superconducting quantum interference device magnetometer. The transition from ferrimagnet to paramagnet at 973 K is due to the formation of ZnFe2O4. High quadrupole splitting values in Mössbauer spectra depict the presence of interstitial Co defects. The Co cations diffuse in the ZnO lattice in the course of annealing at 1273 K, forming CoxZn1-xO resulting in ferromagnetism.

Original languageEnglish
Article number143901
JournalJournal of Applied Physics
Volume122
Issue number14
DOIs
Publication statusPublished - Oct 14 2017

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Herojit Singh, L., Pati, S. S., Oliveira, A. C., Garg, V. K., & Kuzmann, E. (2017). Thermal-induced magnetic transition in CoFe2O4@ZnO. Journal of Applied Physics, 122(14), [143901]. https://doi.org/10.1063/1.4998528