Abstract
In this paper, (SrFe12O19 and NiFe2O4) nanostructure ferrite particles were synthesized via the co-precipitation of chloride salts utilizing the sodium hydroxide solution. The resulting precursors were heat-treated at 1100°C for 4h. After cooling in the furnace, the ferrite powders were pressed at 0.1MPa and then sintered at 1200°C for 4h. The spectroscopy and characterization of peaks at the microwave range (X-band) for the nanostructure ferrite particles were investigated by the ferromagnetic resonance/transmit-line theories and Reflection Loss (RL) plots. The extracted data from these theoretical and experimental results showed that the natural ferromagnetic resonance can be lead to the narrow peaks and the width of the peaks can be related to the periodic effects. Two kinds of peaks were seen for NiFe2O4 at X-band (8–12GHz); the narrow peak at (9.8GHz) was remaining unchanged and consistent while the wide one was shifted from 11GHz to 8.5GHz by decreasing the thickness of the samples. These phenomena were also happened for SrFe12O19 samples. The natural resonance was not happened due to the hard magnetic properties of these nano structure particles.
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