High-frequency applications of bismuth-doped Co–Zn ferrite nanoparticles for electromagnetic interference filter and multilayer inductor chip fabrication.

In this paper, we report the synthesis of single-phase nanoparticles of Bi3+-doped cobalt zinc ferrite by employing the sol–gel auto combustion technique where the average crystallite size ranges between 11 and 18 nm. Fourier transform infrared spectra show the presence of two prominent peaks around 400 cm−1 and 593 cm−1. The magnetic studies reveal that all the samples exhibit ferrimagnetic ordering where both the saturation magnetization and magnetocrystalline anisotropy decrease due to the spin canting effect caused by the Bi ions. The dielectric constant decreases, while the permeability increases with Bi3+ ion substitution, followed by a decrease in the magnetic loss. The total shielding effectiveness (SET) value increased with doping and a maximum value of 12.8 dB was reported for the composition x = 0.15. The shielding effectiveness due to the absorption (SEA) decreases with frequency, while the shielding effectiveness due to reflection (SER) increases with frequency and doping, which shows that the sample is a good choice for the electromagnetic interference filter application and multilayer inductor chip fabrication. [ABSTRACT FROM AUTHOR]