fig5

Figure 5. (A-E) shows the Cole-Cole curves of NH, CH, NCH1, NCH2 and NCH3; (F) shows the RL values of NCH1 related to frequency and thickness, the pentagrams indicate that the frequencies corresponding to the RL values of different thicknesses exactly fall on the λ/4 frequency curve; (G) represents conductive loss (ε_c″); (H) represents polarisation loss (ε_p″). NH: Nickel-only material; CH: cobalt-only material; NCH1: nickel-cobalt hybrid material (Ni²⁺:Co²⁺ = 1:3); NCH2: nickel-cobalt hybrid material (Ni²⁺:Co²⁺ = 3:1); NCH3: nickel-cobalt hybrid material (Ni²⁺:Co²⁺ = 1:1); RL: reflection loss.