Synthesis and microwave absorbing properties of Mn-Zn nanoferrite produced by microwave assisted ball milling

In this paper, well dispersed spinel MnxZn1-xFe2O4 (x = 0.3,0.5 and 0.7) were obtained by microwave assisted ball milling at 2.45 GHz through only one step. The synthesized products were characterized by X-ray diffraction, high resolution transmission electron microscope, vibration sample magnetometer, and vector network analysis. Synthesized Mn-Zn nanoferrite showed the saturation magnetization reached 84.91emu/g when the x was 0.7 and the largest magnetic loss tangent at the frequency of 2.45 GHz. Microwave absorbing properties of these composites were studied at the frequency range of 2-18 GHz. Two microwave reflection loss peaks appeared for all the spinel ferrite. When x was 0.5, the minimum reflection loss appeared at the highest frequency. When x was 0.7, these two minimum reflection loss peaks, -17.36 and -48.13 dB, were calculated with the -10 dB bandwidth at the frequency ranges of 2.24-5.04 and 13.28-14.88 GHz, respectively. Resonance reflection loss peaks shifted to lower frequencies when the matching thickness increased.