Influence of Misorientation Angle Between Adjacent Grains on Magnetization Reversal in Nd-Fe-B-Based Sintered Magnet

抄録

  To clarify the difference between the degree of alignment dependence of coercivity and the angular dependence of coercivity, the crystal orientation distribution and demagnetization curve of Nd-Fe-B-based sintered magnets with different degrees of alignment were compared. It is suggested that the increase in coercivity due to a low degree of alignment cannot be explained only by the angular dependence of coercivity. A crystal orientation analysis and in-situ observation of magnetic domains that were performed in the same area clarified that the ratio of the grain boundary where the magnetization reversal stopped became larger when the misorientation angle between adjacent grains became larger. This suggests that a grain boundary having a larger misorientation angle is one of the factors that suppresses magnetization reversal.