Carbon encapsulated Fe nanoparticles were obtained using arc plasma synthesis. TEM (transmission electron microscopy) and Mössbauer spectroscopy showed that Fe particles consist of metallic and carbide phases encapsulated by graphitic carbon. The particles were of 10 –100 nm in diameter, and were covered by carbon layers 5-15 nm thick. The transmission Mössbauer spectra revealed two magnetic and two paramagnetic components, related to iron containing phases. It was shown that about 47% of iron atoms are located in the Fe₃C phase. The remaining iron belongs to the bcc Fe and fcc Fe(C) phases. Magnetic measurements showed that saturation magnetization M_s was equal to 53 emu/g, which is about 25% of the saturation magnetization of bulk iron. The remnant to saturation magnetizations ratio was M_r/M_s ~ 0.15, showing that the carbon coated Fe nanoparticles are ferromagnetic.

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