RARE EARTH-IRON-MANGANESE-NITROGEN MAGNETIC POWDER

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PROBLEM TO BE SOLVED : To provide rare earth-iron-manganese-nitrogen magnetic powder having excellent coercivity and an excellent square shape by allowing amorphous phases existing at random inside a main phase, which have long and short wire shapes with a high concentration in Mn and N. SOLUTION : The rare earth-iron-manganese-nitrogen magnetic powder is substantially constituted of rare earth elements, Fe, Mn, and N, where an N content is not less than 3.5 wt.% based on the whole, an average particle diameter is not less than 10 μm, and the coercivity is not less than 320 kA/m. The powder includes : the main phase composed of the phases with the crystal structure of rhombohedral crystal or hexagonal crystal with the rare earth elements, Fe, Mn, and N as components; and the amorphous phases more heavily doped in Mn and N than that of the main phase, which have the diameter of not more than 20 nm, and have the long and short wire shapes. COPYRIGHT : (C)2007, JPO&INPIT