RARE EARTH-IRON-NITROGEN SYSTEM MAGNETIC POWDER AND METHOD FOR PRODUCING SAME

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The present invention relates to : a rare earth-iron-nitrogen system magnetic powder which has excellent heat resistance and magnetic characteristics, especially excellent coercivity and magnetization; and a method for producing this rare earth-iron-nitrogen system magnetic powder. This rare earth-iron-nitrogen system magnetic powder contains a rare earth element R, iron Fe and nitrogen N as main constituents, while having a crystal structure of Th2Zn17 type, Th2Ni17 type or TbCu7 type and an average particle diameter of from 1 μm to 10 μm (inclusive), and is characterized in that a shell layer having a thickness of 10 nm or more but less than 200 nm, which is less than 2% of the average particle diameter of the powder, is formed on the particle surfaces of the powder, said shell layer having the same crystal structure, with from 1% by atom to 20% by atom (inclusive) of Fe being substituted by Cr, and with N being contained in an amount of from 10% by atom to 20% by atom (inclusive).