Carbon-coated　iron　nitride　nanoparticles　were　synthesized　using　ferrocene　as　the　precursor　material　with　an　in-house　manufactured　microwave-plasma　reaction　system.　XRD　revealed　that　the　nanoparticles　contained　mixed　phases　of　iron　nitride　(FeN(0.0589)ande-Fe3N)　and　alpha-Fe.　In　the　case　of　TEM,　the　powder　displayed　a　core-shell　structure　with　a　core　diameter　of　similar　to　15　nm　and　had　a　multilayer　carbon　structure.　The　particle　sizes　in　all　samples　were　10-80　nm.　The　Raman　spectra　of　the　nanoparticles　justified　that　the　multilayer　carbon　coatings　had　an　amorphous　graphitic　structure.　The　nanoparticles　developed　at　an　N(2)flow　rate　of　10　slpm　yielded　a　superior　Ms　value　of　37.2　emu　g(-1).　An　increase　in　the　N(2)flow　rate　exhibited　a　significant　influence　on　the　plasma　temperature　and　reaction　time,　thereby　affecting　the　composition　of　the　mixed　phase,　the　shape　and　size　of　the　particles,　and　the　uniformity　and　thickness　of　the　carbon　coating.　This　study　provided　a　simple,　efficient　and　economical　method　to　prepare　iron　nitride　magnetic　nanoparticles,　which　is　expected　to　be　widely　applied　in　industrial　mass　production.