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IJPAP Vol.44(02) [February 2006] >

Title: Superparamagnetic behaviour of nano-particles of Ni-Cu ferrite
Authors: Dolia, S N
Chander, Subhash
Sharma, M P
Kumar, Sudhish
Keywords: Nano-particles
Spinel ferrite
Super-paramagnetic behaviour
Issue Date: Feb-2006
Publisher: CSIR
IPC CodeB82B
Abstract: The nano-particles of Ni0.8Cu0.2Fe2O4 with a log-normal size distribution of the median diameter of 9 nm and standard deviation of 0.60 have been synthesized by the chemical co-precipitation method followed by annealing at 500°C. The cubic spinel structure in single phase has been confirmed by X-ray diffraction. Reduction in saturation magnetization has been explained on the basis that the magnetic moments in the surface layers, outside the core are in a state of frozen disorder. The dc magnetization is measured which show that the nano-particle sample is super-paramagnetic above the blocking temperature of 250 K. Secondly, the departure of fc curve from the zfc curve is suggestive of temporal relaxation.
Page(s): 169-172
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.44(02) [February 2006]

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