  The bulk samples of CuO and Fe-doped CuO were synthesized by ceramics
methods. Structural and compositional analyses were performed by using X-ray
diffraction, SEM, and EDAX. Through this manuscript, we are going to report the
effect of trivalent iron doping (Fe$^{3+}$) in copper (II) oxide
(Cu$_{0.95}$Fe$_{0.05}$O) bulk samples on magnetic and dielectric behavior. The
paramagnetic phase has been established in CuO as a result of Fe$^{3+}$ doping.
The strong correlation between magnetic and dielectric properties indicated
spin-polaron interaction at the transition temperature. Bulk CuO and also
Cu$_{0.95}$Fe$_{0.05}$O exhibit the multiferroic phase in a narrow temperature
range (190 K to 230 K). Two transitions happened from a
paramagnetic-paraelectric phase to incommensurate or asymmetrical
antiferromagnetic (AF) and ferroelectric state near highest Neel temperature
(TN1) ~230 K and another second phase transition, the order of AF phase
transformed to commensurate AF phase and ferroelectricity disappeared at around
the Neel temperature (TN2) ~210 K in all samples. This Cu$_{0.95}$Fe$_{0.05}$O
would show its potential in the spintronic application for a high dielectric
constant with low loss and high magnetic susceptibility.
