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Induced Size Effect On NixCo1-xFe2O4 (0.1 ≤ X ≤ 0.9)

Ajay Shankar, Sandeep Kumar, Sanjeeve Thakur, Rajni Porwal, R. P. Pant

Volume 3, Issue 5, Page 415-420, Year 2012, Current Issue | DOI: 10.5185/amlett.2012.6370

Keywords: Core-shell structure; strain; superparamagnetism; ESR; dipolar interactions.

Abstract: 

Nanocrystalline NixCo1-xFe2O4 were synthesized and studied for their structural and magnetic properties. The effect of doping ion concentration on lattice parameter, crystallite size and the lattice strain pertaining to the ionic radii has been investigated. Electron microscopy supports the parameters and gives morphological view of the system. The magnetic measurement reveals the information on the effect of stoichiometry variation in existing superparamagnetism. Further, the spin dynamics and their role on dipolar interactions, extent of superexchange and spin-spin relaxation among nanoparticles have been investigated. Also, an attempt has been made to understand the UV irradiation effect on photosensitive Co2+ ion on Ni ferrite by in-situ electron spin resonance measurements. Copyright © 2012 VBRI Press.

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