Samarium-iron-nitrogen based sintered magnet and method for producing samarium-iron-nitrogen based sintered magnet

摘要

PROBLEM TO BE SOLVED: To provide a samarium-iron-nitrogen based sintered magnet which includes crystal grains pulverized to a size close to a grain size of a single magnetic domain, and is superior in coercive force.SOLUTION: A samarium-iron-nitrogen based sintered magnet is provided, which comprises a samarium-iron-nitrogen based alloy, where crystal grains included therein are larger than 0.04 μm and 5 μm or less in average grain diameter, and which has an oxygen content of 0.7 wt% or less. Also, a samarium-iron-nitrogen based sintered magnet is provided, which comprises a samarium-iron-nitrogen based alloy, where crystal grains included therein are larger than 0.04 μm and 5 μm or less in average grain diameter, and an oxygen content (wt%) and the average grain diameter (μm) of the crystal grains satisfy the relation given by the following formula (1): (Oxygen content)×(Average grain diameter of crystal grains)2.2 (1).SELECTED DRAWING: Figure 1