Voltage resonance phenomenon and simulation of electrical properties of (FeCoZr)x(PbZrTiO3)(100-x) nanocomposite films

In this paper, the frequency dependencies of phase angle, capacity in a parallel replacement system, conductivity and loss coefficient of ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100-x) with x = 55.9 at.% were studied. Tested material was deposited by ion beam sputtering with use of mixed argon-oxygen atmosphere in a vacuum chamber and subdued by a 15-min annealing in air in the temperature of Ta =498 K. The type of electrical conduction in the material for frequencies f ˂ 2×105Hz was defined as capacitive. At frequencies above fR = 2×105 Hz there are positive phase angle values, which corresponds to the inductive type of conduction. This means that the voltage resonance occurs in the nanocomposite, which indicates the voltage compensation on the reactive (inductive and capacitive) components of the impedance in the sample. It leads to the appearance of minima and maxima on the Cp(f) and tgδ(f) characteristics respectively. The σ(f) characteristic demonstrates strong conductivity dependence from frequency, which can be explained by hopping mechanism of charge exchange in the material. The simulation of AC electrical parameters based on parallel connection of two branches with serial RLC elements were performed for the frequency range 50 Hz ˂ f ˂ 106Hz. It demonstrates high compatibility of measured and calculated results which suggests the possibility of replacing the actual conventional RLC circuits of electronic components and finding other applications of (FeCoZr)x(PbZrTiO3)(100-x) nanocomposites in electronics and engineering.