Thermal-induced magnetic transition in CoFe2O4@ZnO

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...

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Bibliographic Details
Published in:Journal of applied physics 2017-10, Vol.122 (14)
Main Authors: Herojit Singh, L., Pati, Sudhanshu S., Oliveira, A. C., Garg, Vijayendra K, Kuzmann, Erno
Format: Article
Language:English
Subjects:
Annealing
Applied physics
Cations
Cobalt ferrites
Ferrimagnetism
Lattice parameters
Magnetic properties
Magnetic transitions
Nanomaterials
Quadrupoles
Spectrum analysis
Superconducting quantum interference devices
X-ray diffraction
Zinc oxide
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4998528