Ferromagnetic fine particles of epsilon iron carbide and method for producing the same

摘要

Ferromagnetic granular ultrafine particles consisting essentially of epsilon ' iron carbide represented by the composition formula: epsilon '-Fe2.2Chaving an average particle size of about 0.01 to 0.2 mu m, and ferromagnetic acicular ultrafine particles consisting essentially of epsilon ' iron carbide represented by the composition formula: epsilon '-Fe2.2Chaving a major axis of about 0.05 to 0.5 mu m, a minor axis of about 0.01 to 0.06 and an axial ratio of 4 to 20, which have good coercive force and a small magnetic domain.