Electron paramagnetic resonance, magnetic and electrical properties of CoFe2O4 nanoparticles

CoFe2O4 nanoparticles were prepared by solution combustion method. The nanoparticle are characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy and scanning electron microscopy (SEM). PXRD reveals single phase, cubic spinel structure with Fd3¯m (227) space group. SE...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2013-08, Vol.339, p.40-45
Main Authors: Jnaneshwara, D.M., Avadhani, D.N., Daruka Prasad, B., Nagabhushana, B.M., Nagabhushana, H., Sharma, S.C., Shivakumara, C., Rao, J.L., Gopal, N.O., Ke, Shyue-Chu, Chakradhar, R.P.S.
Format: Article
Language:English
Subjects:
Combustion
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric loss
Electron paramagnetic resonance
Electronics
EPR
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Nanocomposites
Nanomaterials
Nanoparticle
Nanoparticles
Nanostructure
Physics
Saturation magnetization
Scanning electron microscopy
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Summary:CoFe2O4 nanoparticles were prepared by solution combustion method. The nanoparticle are characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy and scanning electron microscopy (SEM). PXRD reveals single phase, cubic spinel structure with Fd3¯m (227) space group. SEM micrograph shows the particles are agglomerated and porous in nature. Electron paramagnetic resonance spectrum exhibits a broad resonance signal g=2.150 and is attributed to super exchange between Fe3+ and Co2+. Magnetization values of CoFe2O4 nanoparticle are lower when compared to the literature values of bulk samples. This can be attributed to the surface spin canting due to large surface-to-volume ratio for a nanoscale system. The variation of dielectric constant, dielectric loss, loss tangent and AC conductivity of as-synthesized nano CoFe2O4 particles at room temperature as a function of frequency has been studied. The magnetic and dielectric properties of the samples show that they are suitable for electronic and biomedical applications. ► CoFe2O4 magnetic nanopowder has been prepared at much lower temperature. ► Sample is well characterized by PXRD, SEM and FTIR spectroscopy. ► Magnetic, electrical and dielectric properties were reported. ► EPR and magnetic properties were correlated to compare the magneto anisotropy.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2013.02.028