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Title: Magnetic study of nanoparticles of Mg0.95Mn0.05Fe2O4 spinel ferrite
Authors: Sharma, S K
Dolia, S N
Kumar, Ravi
Knobel, M
Kumar, V V Siva
Singh, M
Keywords: Nanoparticles;Spinel ferrites;Superparamagnetism
Issue Date: Oct-2006
Publisher: CSIR
IPC Code: H01F41/30
Abstract: Magnetization of nanoparticles of Mg-Mn ferrite, synthesized using high energy ball milling has been studied. X-ray diffraction pattern of the particles milled for 6 h confirmed the single-phase cubic spinel structure with a lattice parameter of 8.47 Å.   Langevin function fitting on M-H data at 300K gives a log-normal particle size distribution with median diameter of 6.4 nm and standard deviation 0.7. The isothermal dc magnetization studies have been performed using SQUID and vibrating sample magnetometer in the temperature range 5-300 K. These measurements show that the sample is superparamagnetic above the blocking temperature TB ~ 246 K.  The reduction in saturation magnetization in the case of nanoparticles has been explained on the basis that the magnetic moments in the surface layers outside the core are in a state of frozen disorder.
Page(s): 771-773
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.44(10) [October 2006]

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