SmFeN magnet, also known as Sm₂Fe₁₇N₃, has always been expected as a potential option for next generation of permanent magnetic material, thus attracted many attentions since its discovered by Michael Coey in 1990. SmFeN has many advantages, include:

• The curie temperature can reach 476 degrees Celsius which much higher than conventional sintered Neodymium magnet.
• Magnetocrystalline anisotropy field is three times as big as Nd₂Fe₁₄B and has huge potential to fabricate high coercivity magnets.
• SmFeN magnet did not have to add Cobalt or other heavy rare earth elements (HREEs) to adjust magnetic properties.
• Superior corrosion and oxidation resistance.

Sm₂Fe₁₇N₃ phase will decompose into SmN phase and α-Fe phase once the ambient temperature exceeds 650 degrees Celsius. Thereby, sintered SmFeN magnets cannot be manufactured via conventional sintering technology. Commercialization of SmFeN magnet is firstly realized in bonded magnet area by Japanese companies. Either isotropic magnet or anisotropic magnet needs stable raw SmFeN powder. Daido applied rapidly quenched technology to prepare isotropic powder and magnet’s performance even higher than compression molded NdFeB magnet. Both Nichia and Sumitomo utilized reduction-diffusion technology to obtain anisotropic powder which well suited to injection molded magnet.