Abstract
NixZn0.9−xMn0.1Fe2O4 (0.3 ≤ x ≤ 0.7) ferrites were synthesized using the conventional ceramic process- ing method. A 1 wt% B2O3 was added to initial mixture to inhibit crystal growth and to decrease phase forma- tion temperature. The structural, magnetic, dielectric, and microwave properties of samples have been investigated using X-ray diffraction (XRD), scanning electron micro- scope (SEM), vibrating sample magnetometer (VSM), and near-field microwave measurements in RF Impedance Ana- lyzer. Magnetization measurements revealed that saturation magnetization of the Mn-substituted Ni-Zn ferrite increases as nickel concentration increases up to x = 0.6. The sat- uration magnetization has the highest value of 78 emu/g in the Ni0.6Zn0.3Mn0.1Fe2O4 sample. All samples have negligible coercive fields of few oersteds. Microwave mea- surements 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
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