Nd-Fe-B系焼結磁石の圧縮応力による磁区構造変化

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2017/07/01

タイトル(英語): Change in Magnetic Domain Structure of Nd-Fe-B Sintered Magnets by Compressive Stress

著者名: 竹澤　昌晃（九州工業大学 大学院工学研究院），森本　祐治（九州工業大学 大学院工学研究院），江島　潤（九州工業大学 大学院工学研究院），中野　善和（三菱電機（株） 先端技術総合研究所），荒木　健（三菱電機（株） 先端技術総合研究所）

著者名(英語): Masaaki Takezawa (Faculty of Engineering, Kyushu Institute of Technology), Yuji Morimoto (Faculty of Engineering, Kyushu Institute of Technology), Jun Ejima (Faculty of Engineering, Kyushu Institute of Technology), Yoshikazu Nakano (Advanced Technology R&D Center, Mitsubishi Electric Co.), Takeshi Araki (Advanced Technology R&D Center, Mitsubishi Electric Co.)

キーワード: Nd-Fe-B，磁区，Kerr効果，圧縮応力，減磁　　Nd-Fe-B，magnetic domain，Kerr effect，compressive stress，demagnetization

要約(英語): To clarify the relationship between compressive stresses and demagnetization of Nd-Fe-B sintered magnets, we have examined the change in domain configuration by compressive stresses using a Kerr microscope. The magnetic domains of five kinds of Nd-Fe-B sintered magnets have been observed. The magnets have a coercivity of 0.8-1.4 MA/m and residual magnetic flux density of 1.3-1.5 T. Irreversible demagnetization of Nd-Fe-B magnets with a low coercivity of 0.875 MA/m and high residual magnetic flux density of 1.41-1.47 T have occurred from applying a compressive stress of 100 MPa. The compression-affected area is approximately 0.14%. The stress more than 50 MPa is needed to demagnetize Nd-Fe-B magnets. The amount of irreversible demagnetization depends upon the intensity of the compressive stress as well as the residual magnetic flux and coercive force of the magnets.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.137 No.7 （2017） 特集：平成28年基礎・材料・共通部門大会－テーマ付きセッション：ナノ磁性体の物性と機能性－

本誌掲載ページ: 367-373 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/137/7/137_367/_article/-char/ja/