首页|The effect of the annealing temperature on the microstructural, magnetic, and spin-dynamical properties of Mn–Mg–Cu–Zn ferrites
The effect of the annealing temperature on the microstructural, magnetic, and spin-dynamical properties of Mn–Mg–Cu–Zn ferrites
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NSTL
Elsevier
? 2021 Elsevier B.V.The effect of the annealing temperature on the structural and magnetic properties of Mn0.15Mg0.15Cu0.2Zn0.5Fe2O4 ferrite nanoparticles was investigated. All samples were carefully characterized using different techniques. The structural results showed that the ferrite was annealed at temperatures above 750 °C, and its structure was a combination of cubic spinel and hematite phases. Moreover, the XPS analysis showed that the valence state of the surface-metal ions and the surface-oxygen species played an important role in the structural and magnetic changes of this ferrite, so the increase in the hematite phase with the annealing temperature can be explained by the evaporation of the zinc content and the formation of a magnesium-metal state. The imaginary susceptibility as a function of the temperature of the samples shows a broad peak at high temperatures related to the blocking temperature of the interacting superparamagnetic nanoparticles and a second sharp peak related to the insulating spin-glass temperature.
NSTL
Elsevier
