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|Title:||Magnetic behaviour of nano-particles of Ni<sub>0.5</sub>Co<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> prepared using two different routes|
Srivastava, Bipin K
|Series/Report no.:||H 01 F 41/30|
|Abstract:||Literature reports on bulk sample of the ferrite Ni<sub>0.5</sub>Co<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> confirm a complete inverse spinel structure. On site occupancy and magnetic anisotropy on nano-particle samples of the titled ferrite prepared using two different routes – a wet chemical co-precipitation process and sol-gel method have been studied. Estimated average particle sizes of the two samples (referred to as NCWET and NCSOL) are ~75Å and ~190Å respectively. Small angle neutron scattering measurements made on the fluid sample comprising the sample prepared by wet chemical process gives median size ~77Å with standard deviation σ = 0.60. Mössbauer studies at 300K show that the two ferrite samples maintain inverse spinel structure even in nano-crystalline state. Magnetization and Mössbauer measurements show that part of the sample in both the cases is in superparamagnetic state. Magnetic anisotropy is larger in the nano-particle state and surface spin disorder also contributes to this.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.42(05) [May 2004]|
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