fig5

Figure 5. EM wave absorption performance and loss mechanism analysis of FeCoCu alloy foams with different Cu contents. Three-dimensional reflection loss maps of (A) Fe₇₀Co₃₀, (B) Fe₆₅Co₃₀Cu₅, (C) Fe₆₀Co₃₀Cu₁₀ and (D) Fe₅₀Co₃₀Cu₂₀, respectively. Corresponding two-dimensional reflection loss contour maps of (E) Fe₇₀Co₃₀, (F) Fe₆₅Co₃₀Cu₅, (G) Fe₆₀Co₃₀Cu₁₀ and (H) Fe₅₀Co₃₀Cu₂₀, respectively. The dashed contour lines indicate RL = −10 dB, and the maximum EABs are marked in the corresponding panels. Frequency-dependent (I) attenuation constant, (J) input impedance, (K) interference loss contribution, and (L) total energy loss contribution are presented to clarify the EM absorption mechanism. EM: Electromagnetic; RL: reflection loss; EAB: effective absorption bandwidth.