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Ni x Zn 0.9−x Mn 0.1 Fe 2 O 4 (0.3 ≤ x ≤ 0.7) ferrites were synthesized using the conventional ceramic processing method. A 1 wt% B 2 O 3 was added to initial mixture to inhibit crystal growth and to decrease phase formation temperature. The structural, magnetic, dielectric, and microwave properties of samples have been investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), vibrating sample magnetometer (VSM), and near-field microwave measurements in RF Impedance Analyzer. Magnetization measurements revealed that saturation magnetization of the Mn-substituted Ni-Zn ferrite increases as nickel concentration increases up to x = 0.6. The saturation magnetization has the highest value of 78 emu/g in the Ni 0.6 Zn 0.3 Mn 0.1 Fe 2 O 4 sample. All samples have negligible coercive fields of few oersteds. Microwave measurements revealed that ferromagnetic resonance occurs at around 1.8 GHz and minimum reflection loss attained is less than −20 dB with sample thickness of 10 mm. The observed resonance is due to the domain wall motion. As a result, these materials can be used in microwave absorbers in low-frequency range (i.e., 0.1-3 GHz) as magnetic fillers.

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