Mg_(1.3-x)Mn_xAl_yFe_(1.8-y)O_4 (x=0.1～0.2, y=0.15～0.3) spinel ferrites have been prepared using conventional ceramic technique. Highly densified Mg-Mn-Al ferrites (99% theoretical density) were obtained in this work. The microstructure, magnetic properties and ferromagnetic resonance linewidth (ΔH) of Mg-Mn-Al ferrites have been analyzed by X-ray diffraction, B-H analyzer and FMR spectrometer. The results revealed that all the samples were a single spinel phase. With Mn content increasing and Al content decreasing, both saturation magnetisation (4πM_s) and Squareness Ratio (SQR) increases, while the coercivity (H_c) first increases and then decreases. In addition, good ferromagnetic resonance linewidth (i.e. ΔH) properties were also realized as 143.8 Oe at 9.3 GHz for the sample with x = 0.17 and y = 0.20. The results imply that Mg_(1.3-x)Mn_xAl_yFe_(1.8-y)O_4 ferrites may be applicable for X-band (8～12 GHz) microwave devices.
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