高分解能Ｋｅｒｒ効果顕微鏡を用いたＮｄ‐Ｆｅ‐Ｂ系微細結晶粒磁石の磁区観察と磁化過程解析

• 竹澤 昌晃

  九州工業大学大学院工学研究院先端機能システム工学研究系

書誌事項

タイトル別名

• Magnetic Domain Observation and Magnetization Process Analysis of Nd-Fe-B Sub-Micron Grain Sized Magnet with High-Resolution Kerr Microscope

抄録

  A Kerr microscope that uses ultraviolet (UV) light for high-resolution magnetic domain observation was built, and the domain structure and magnetization process of hydrogenation-disproportionation-desorption-recombination (HDDR) magnets were examined. The UV Kerr microscope can observe nanometer-sized domain patterns. The coercivity of the HDDR magnet depends on the area of magnetization reversal during a reversal process. Magnetization reversal in a few grains simultaneously occurs in a low-coercivity magnet, because the Nd-rich phase along the grain boundaries is absent. On the other hand, magnetization reversal in a grain independently occurs owing to an adequate Nd-rich phase along the grain boundaries in a high-coercivity magnet. It follows that the high coercivity of an HDDR magnet is due to domain wall pinning at the grain boundaries.<br>

収録刊行物

• 日本金属学会誌

  日本金属学会誌 76 (1), 48-51, 2012

  公益社団法人 日本金属学会

キーワード

• Kerr microscope
• hydrogenation-disproportionation-desorption-recombination (HDDR) process
• magnetic domain observation
• neodymium-rich phase
• ultraviolet (UV) light

詳細情報

• CRID: 1390001206482180992
• NII論文ID: 130004456254
• DOI: 10.2320/jinstmet.76.48
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/76/1/76_1_48/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可