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(a) TEM and (b) high-resolution-TEM image of CoNi@C nanocapsules; (c) sketch of incident EMW and absorber layer (nanocapsules uniformly mixed with wax) with thickness of d mm.
(a) Frequency dependence of the relative complex permittivity; (b) Cole-Cole plot. The two dashed circles are guides to the eyes, a = (ε s + ε ∞)/2, r = (ε s-ε ∞)/2, ε s denotes the static limit of the permittivity and ε ∞ is thehigh-frequency limit of the permittivity; (c) frequency dependence of the relative complex permeability, and (d) frequency dependence of μ″(μ′)−2 f −1.
(a) and (b) Frequency dependence of measured and fitted curves of the real part of the permeability μ′ and imaginary part μ″ of the permeability (the measured data and fitted curves are represented by open circles and the solid lines, respectively), and (c) frequency dependence of the dielectric-loss factor and the magnetic-loss factor.
(a) Frequency dependence of the microwave RL and (b) contour map of the bandwidth with RL < −10 dB (90% absorption) as a function of the absorber thickness.
Fitting parameters for the permeability dispersion spectra. f fit and f calc are the fitted and calculated resonance frequency, respectively. I is the intensity of the resonance peak and α the damping coefficient. u kn is the eigenvalue of the derivative of the spherical Bessel function j n(u).
EMW-absorption properties of some earlier reported nanocomposites. The absorber thickness denotes the layer-thickness (range) for which RL < −25 dB. The weight ratio represents the material-wax ration in the absorber. The maximum RL value corresponds to the largest absolute value of RL. The absorption band width represents the frequency range for which RL < −25 dB.
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