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Electron paramagnetic resonance, magnetic and electrical properties of CoFe2O4 nanoparticles

Jnaneshwara, DM and Avadhani, DN and Prasad, Daruka B and Nagabhushana, BM and Nagabhushana, H and Sharma, SC and Shivakumara, C and Rao, JL and Gopal, NO and Ke, Shyue-Chu and Chakradhar, RPS (2013) Electron paramagnetic resonance, magnetic and electrical properties of CoFe2O4 nanoparticles. In: Journal of Magnetism and Magnetic Materials, 339 . pp. 40-45.

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Official URL: http://dx.doi.org/10.1016/j.jmmm.2013.02.028


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 Fd (3) over barm (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.

Item Type: Journal Article
Publication: Journal of Magnetism and Magnetic Materials
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Combustion; Nanoparticle; EPR; Dielectric Loss; Saturation Magnetization
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 11 Jul 2013 05:40
Last Modified: 11 Jul 2013 05:40
URI: http://eprints.iisc.ac.in/id/eprint/46775

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