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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
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
Magnetism
Super-paramagnetic behaviour |
| Issue Date: | Feb-2006 |
| Publisher: | CSIR |
| IPC Code: | B82B |
| 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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