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|Title:||Superparamagnetic behaviour of nano-particles of Ni-Cu ferrite|
|Authors:||Dolia, S N|
Sharma, M P
|Abstract:||The nano-particles of Ni<sub>0.8</sub>Cu<sub>0.2</sub>Fe<sub>2</sub>O<sub>4 </sub>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 <i style="">dc </i>magnetization is measured which show that the nano-particle sample is super-paramagnetic above the blocking temperature of 250 K. Secondly, the departure of <i style="">fc</i> curve from the <i style="">zfc</i> curve is suggestive of temporal relaxation.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.44(02) [February 2006]|
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