fig6

Figure 6. (A-D) Smith charts of ZnCo₂O₄, Zn_1-xCo₂Ni_xO₄, ZnCo_2-yFe_yO₄ and Zn_1-xCo_2-yNi_xFe_yO₄; (E) Attenuation constant (α) and (F) RLmin of the four absorbers; (G) Schematic illustration of the electromagnetic wave absorption mechanism of Zn_1-xCo_2-yNi_xFe_yO₄. Panels (A-F) were plotted using Origin 2023. RLmin: Minimum reflection loss.