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Title: Magnetic behaviour of nano-particles of Ni0.5Co0.5Fe2O4 prepared using two different routes
Authors: Chander, Subhash
Srivastava, Bipin K
Krishnamurthy, Anjali
Keywords: Magnetic anisotropy
Spinel ferrites
Issue Date: May-2004
Publisher: CSIR
Series/Report no.: H 01 F 41/30
Abstract: Literature reports on bulk sample of the ferrite Ni0.5Co0.5Fe2O4 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.
Description: 366-370
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.42(05) [May 2004]

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