Magnetic field intensity and γ-Fe2O3 concentration effects on the dielectric properties of magnetodielectric tissues

Highlights: • Smart tissues are synthesized with silicone oil, carbonyl iron and $\gamma -{\mathrm{Fe}}_2{O}_3$ particles. • Plane electric capacitors are prepared with smart tissues as dielectric materials. • $\gamma -{\mathrm{Fe}}_2{O}_3$ with 10 • Magnetic fields up to 240 kA/m change sensibly the electrical properties. • Medium-frequency electric fields change sensibly the electrical properties. - Abstract: Microfiber-based tissues are prepared by impregnation of an absorbent cloth with silicone oil mixed with carbonyl iron and various volume concentrations of $\gamma -{\mathrm{Fe}}_2{O}_3$ nanoparticles. Plane capacitors are manufactured having the microfiber tissues as dielectric materials. The equivalent capacitance ($C_p$) and resistance ($R_p$) are measured without a magnetic field, and respectively with a magnetic field superimposed on a medium-frequency electric field. From the measured values of $C_p$ and $R_p$ we determine the absorption-dispersion characteristics, the Cole-Cole diagrams, static and optical relative permittivities, and relaxation times of the tissues. We show that in the presence of the magnetic field superimposed on the electric one, the dielectric properties of the tissues are sensibly influenced by the concentration of $\gamma -{\mathrm{Fe}}_2{O}_3$ nanoparticles.