| Nanoparticles in the n(Fe2O3)/(1-n)ZnO system (where the composition index n=0.05, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, and 0.70) were prepared by using a microwave assisted hydrothermal method. According to XRD analysis the main phase was ZnFe2O4. The ferromagnetic resonance (FMR) investigation of the obtained samples has been carried out at room temperature. An almost symmetrical and very intense magnetic resonance line centred near g=2.0 was recorded in all samples. The integrated intensity of lines increased with the ferrite content, reaching a maximum for n=0.70. The magnetic resonance study has shown that the magnetic resonance line originates from magnetic nanoparticles ZnFe2O4 and strongly depends on the concentration of the ferrite spinel. The magnetic resonance results have been compared with a similar study of samples the same system but obtained using a high temperature treatment in a classical coprecipitation-calcination synthesis. The analysis of the magnetic resonance data has shown that the concentration of ZnFe2O4 was smaller in samples obtained by the hydrothermal method and this is consistent with XRD results. |
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