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Frequency dependence of real and imaginary parts of complex permittivity and permeability of Co/C with the filler loading of 15 wt % (a), 30 wt % (b), 45 wt % (c); and Co/C@PPy with the filler loading of 5 wt % (d), 10 wt % (e), 12 wt % (f), 15 wt % (g), 30 wt % (h).
