Enhanced Saturation Magnetization in Cobalt Doped Ni-Zn Ferrite Nanoparticles

Abstract

The Co substitution in Ni-Zn ferrites with respect to their structural and magnetic properties has been investigated in favor to select a material for future electromagnetic interference (EMI) shielding application purpose. Ni 0.6−x Zn 0.4 Co x Fe 2 O 4 (x = 0, 0.03, 0.09, 0.27) nanoparticles were synthesized using a sol-gel method and annealed at 700 • C. The prepared Ni 0.6−x Zn 0.4 Co x Fe 2 O 4 samples were characterized for their structural, stoichiometric, and magnetic properties. X-ray diffraction patterns reveal the formation of single-phase spinel cubic structure formed at x = 0.27. The influence of Co doping on structural properties of Ni-Zn ferrite was examined with X-ray diffraction and field emission scanning electron microscopy. The stoichiometry of prepared samples has also been examined by energy-dispersive X-ray spectroscopy. The magnetic behavior was studied using a vibrating sample magnetometer at room temperature. The variations in values of saturation magnetization were explained on the basis of spin canting effect imparted by hematite (α-Fe 2 O 3 ) phase with spinel phase. Ni 0.6−x Zn 0.4 Co x Fe 2 O 4 with x = 0.27 possesses best saturation magnetization and can be useful in EMI shielding material.

Corroboration and efficacy of Magneto-Fluorescent (NiZnFe/CdS) Nanostructures Prepared using Differently Processed Core

“…1. The lattice parameters (‘ a ’) obtained from Rietveld refinement in case of pure ferrite and in core@shell structure are in agreement with the experimental results and the values are close to the some of the previously reported values 18,19 . However, ‘ a ’ in case of pure CdS is found to be larger in comparison to core/shell structures this is because of the tensile stress present in pure CdS but as we grow CdS QDs on ferrite core there will be generation of compressive strain that gives the ‘ a ’ near to standard values.…”

Temperature dependent structural, morphological, FTIR, optical, magnetic properties of NiMgZn ferrites

“…Due to small values of coercivity and remanence magnetization, this material can be used in high frequency electronic instruments. Also, the increase in the calcination temperature reduced the canting effect of Zn in the ferrites [14,21]. A comparative study of present work with the related compositions is represented in Table 5.…”

“…The average crystallite size (D) was determined using the Scherrer formula: 0.9λ/β cos θ, for major peaks and for (311) planes, where λ is the wavelength (0.15406 nm) of CuKα radiation, β is the full width half maxima (FWHM) and θ is the diffraction angle [13]. The material calcined at 450 • C showed the presence of Fe 2 O 3 [3,14,15]; this may be due to the incomplete decomposition or non-reacted pre cursors at that temperature as well as lattice distortion. The results of XRD data were displayed in Table 1.…”

“…Also, nano ferrites are used for microwave absorption and EMI shielding properties [9]. The magnetic properties may be enhanced significantly at the nano scale [14].…”

Magnetic properties of Sn-substituted Ni–Zn ferrites synthesized from nano-sized powders of NiO, ZnO, Fe 2 O 3 , and SnO 2

“…The properties of Ni-Zn ferrites can be tailored by altering chemical composition, preparation methods, sintering temperature (T s ) and impurity element or levels and the reports regarding these issues are available in the literatures . Recently, many researchers reported the structural, magnetic and electrical properties of Ni-Zn ferrite and/or substituted Ni-Zn ferrites in bulk [6,12,13,[19][20][21][26][27][28] and nano forms [16,[22][23][24].…”