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Type: Artigo de evento
Title: Size Dependent Magnetic Behaviour Of Nanocrystalline Spinel Ferrite Mg 0.95mn 0.05fe 2o 4
Author: Sharma S.K.
Kumar R.
Kumar V.V.S.
Dolia S.N.
Gupta A.
Reddy V.R.
Knobel M.
Singh M.
Abstract: Mg 0.95Mn 0.05Fe 2O 4 ferrite nanoparticles having dimensions varying from 4.7-12 nm, have been synthesized by using solid-state reaction technique followed by high-energy ball milling for different times. An X-ray diffraction study indicates the presence of single-phase cubic spinel structure. The particle sizes were estimated from the X-ray line broadening of the (311) reflection using Debye-Scherrer's formula. The size-dependent magnetic properties of Mg 0.95Mn 0.05Fe 2O 4 nanoparticles were studied using SQUID magnetometry techniques. The saturation magnetization M s at 5 K obtained by extrapolating M versus 1/H plot to 1/H = 0 were decreased with the decrease in the particle size. The coercive force of the nanoparticles has a clear size-dependence below the blocking temperature. The calculated anisotropy constant was found to be rather large for nanoparticle samples. All these results can be explained on the basis of single-domain superparamagnetic effects.
Rights: fechado
Identifier DOI: 
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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