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Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles
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We report here the investigations on the size dependent variation of magnetic properties of nickel
nanoparticles of different sizes (14 to 22 nm) were prepared by the sol-gel route at different annealing temperatures. They are characterized by TGA-DTA,
, SEM, TEM and Raman spectroscopy techniques for the confirmation of the temperature of phase formation, thermal stability, crystallinity, morphology and structural status of the nickel
nanoparticles. The magnetization studies revealed that the saturation magnetization (Ms
), retentivity (Mr
) increase, while coercivity (Hc
) and anisotropy (Keff
) decrease as the particle size increases. The observed value of Ms
is found to be relatively higher for a particle size of 22 nm. In addition, we have estimated the magnetic domain size using magnetic data and correlated to the average particle size. The calculated magnetic domain size is closely matching with the particle size estimated from XRD. Impedance spectroscopy was employed to study the samples in an equivalent circuit to understand their transport phenomena. It shows that nickel
nanoparticles exhibit a non-Debye behavior with increasing particle size due to the influence of increasing disorders, surface effects, grain size and grain boundaries, etc.
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