Abstract
A ferromagnetic γ-Fe 2O 3–MWCNT composite was prepared by a reverse microemulsion technique, and was transformed to a Fe/Fe 3C–MWCNT composite by further heat-treatment in H 2 atmosphere at 950 °C. TEM result suggests that MWCNTs are both surface decorated and filled with γ-Fe 2O 3 or Fe/Fe 3C nanoparticles. The saturation magnetization and anisotropy field are particularly strong for Fe/Fe 3C–MWCNT. The reflection loss of Fe/Fe 3C–MWCNT is better than that of γ-Fe 2O 3–MWCNT at all frequencies between 2 and 18 GHz, resulting from enhanced magnetic loss and better matched characteristic impedance, rather than electric loss, as shown by the complex relative permeability μ r = μ ′ r − j μ ″ r and permittivity ε r = ε ′ r − j ε ″ r . The microwave absorbing properties can be modulated simply by manipulating the thickness of the prepared Fe/Fe 3C–MWCNT composite for application in different frequency bands.
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