Magnetic Domain Observation of Nd–Fe–B Sintered Magnet at Elevated Temperature

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  • TAKEZAWA Masaaki
    Dept. of Applied Science for Integrated System Engineering, Faculty of Engineering, Kyushu Institute of Technology
  • OGIMOTO Hirofumi
    Dept. of Applied Science for Integrated System Engineering, Faculty of Engineering, Kyushu Institute of Technology
  • MORIMOTO Yuji
    Dept. of Applied Science for Integrated System Engineering, Faculty of Engineering, Kyushu Institute of Technology

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Other Title
  • Nd–Fe–B 系焼結磁石の高温下における減磁過程の磁区観察
  • Nd-Fe-B系焼結磁石の高温化における減磁過程の磁区観察
  • Nd-Fe-Bケイ ショウケツ ジシャク ノ コウオンカ ニ オケル ゲンジカテイ ノ ジク カンサツ

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Abstract

Magnetization reversal and its propagation in sintered Nd–Fe–B magnets were clearly observed at elevated temperature up to 150 ˚C using a Kerr microscope, image processing, and photo editing. Simultaneous magnetization reversal in several grains along the easy axis direction occurred at elevated temperature, and the extent of simultaneous magnetization reversal increased with temperature. This indicates that reduction in the coercivity of Nd–Fe–B sintered magnets at elevated temperatures is attributable to decrease in anisotropy and insufficient pinning of domain walls at grain boundaries.

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