The Cavity Perturbation Technique to Detect Cobalt Ferrite and Cobalt Ferrite-Barium Titanate Core-Shell Nanocomposites in the Microwave Frequency Range for Biomedical Applications

This paper focuses on the cavity perturbation technique to measure the dielectric properties of nanoparticles: (i) cobalt ferrite (ii) barium titanate and (iii) core-shell cobalt ferrite-barium titanate. The shift in TE103 and TE105 resonant mode is compared for the above three nanomaterials which in turn is correlated to its dielectric properties. Barium titanate has the highest shift in resonance peak and it is directly proportional to its relative permittivity followed by cobalt ferrite-barium titanate and cobalt ferrite respectively. However, the half power bandwidth, Delta f is highest for the cobalt ferrite nanoparticles and least for barium titanate. Approximately 1.145 MHz shift and 3.391 MHz shift is observed for the insertion of the lossy core-shell cobalt ferrite in TE103 and TE105 modes. The quality factor for barium titante was measured to be approximately twice to that of cobalt ferrite for this particular experiment.