The Ability of NiFe<sub>2</sub>O<sub>4</sub> Samples to Reduce Electromagnetic Wave Pollution in the Frequency Range of 2-18 Ghz

Abstract

Rapid technological developments have the impact of increasing electromagnetic wave pollution. To reduce this pollution, nickel ferrite (NiFe2O4) nanoparticles are made by using mechanical alloying method with high energy milling in a wet state. X-ray diffractometer was used to characterize the crystal structure and the formed phase; scanning electron microscopy was used to characterize surface morphology; and for magnetization, a vibrating sample of magnetometer was used. Meanwhile, the capability to absorb electromagnetic waves in the 2-18 GHz interval was using a vector network analyzer. NiFe2O4 nanoparticles have a cubic structure, space group Fd-3m, and a crystal size of 127 nm. The shape of the particles resembles a block and is spherical, measuring about 250-300 nm. At room temperature, NiFe2O4 nanoparticles are soft magnetic materials with a magnetic saturation (Ms) of 41.61 emu/g and a coercivity (Hc) of 0.24 kOe. The ability to absorb microwaves, is expressed by reflection loss (RL) ~ -25.81 dB at a frequency (f) 5.16 GHz with a bandwidth (BW) 1.62 GHz, while RL ~ - 18.64 dB at f = 10, 98 GHz with BW = 1.42 GHz.