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Title: Size dependent magnetic behaviour of nanocrystalline spinel ferrite Mg₀․₉₅Mn₀․₀₅Fe₂O₄
Authors: Sharma, S K
Kumar, Ravi
Kumar, V V Siva
Dolia, S N
Gupta, A
Reddy, V R
Knobel, M
Singh, M
Keywords: Mg₀․₉₅Mn₀․₀₅Fe₂O₄;Ferrite nanoparticles;Spinel structure;Debye-Sherrer’s formula
Issue Date: Jan-2007
Publisher: CSIR
IPC Code: H01F 41/30
Abstract: Mg₀․₉₅Mn₀․₀₅Fe₂O₄ 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 Mg₀․₉₅Mn₀․₀₅Fe₂O₄ nanoparticles were studied using SQUID magnetometry techniques. The saturation magnetization Ms 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.
Page(s): 16-20
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.45(01) [January 2007]

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