Abstract
Magnetic oxides, especially Zinc-Nickel (Zn-Ni) ferrites, are used in devices that transmit and receive electromagnetic signals. We present the synthesis of Zn-Ni ferrite, Nickel ferrite and Zinc ferrite by sonochemically assisted solvohydrothermal method. The elemental analysis revealed that the content of Zn ion in the Zn-Ni ferrite is more. The VSM results displayed superparamagnetic behaviour of Zn-Ni ferrite which could be attributed to smaller particle size. Electromagnetic interference (EMI) shielding materials which dominantly shield by absorption mechanism contain both electric and magnetic dipoles. This is an intrinsic feature of Zn-Ni ferrite materials as it has both high value of magnetic permeability and dielectric constant. The higher contribution of absorption makes it a useful material for various applications such as Radar Absorbing Materials (RAMs). Total shielding efficiency of 28.5 dB for Ni-Ferrite and 30.5 dB for Zn-Ni-Ferrite in X band were obtained, all of which was dominated by shielding efficiency due to absorption. This implies more than 99.99% incident microwaves were successfully attenuated by the materials.
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