希土類フリーである正方晶FeCo基合金磁石の開発に向けた進展
希土類フリーである正方晶FeCo基合金磁石の開発に向けた進展
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: 2021/02/01
タイトル(英語): Challenges Toward Development of Rear-earth Free FeCo Based Permanent Magnet
著者名: 長谷川 崇(秋田大学大学院理工学研究科物質科学専攻)
著者名(英語): Takashi Hasegawa (Department of Materials Science, Akita University)
キーワード: 永久磁石,希土類フリー,FeCo,正方晶_x000D_ permanent magnet,rear-earth free,FeCo,tetragonal
要約(英語): Among the various permanent magnets reported to date, FeNdB exhibits the highest magnetic performance, but reducing the use of the rare-earth elements is necessary to avoid exhaustion of rare-earth elements. The key to improve the performance of permanent magnets is to increase magnetization and coercivity. FeCo has a very large magnetization, but has a very small coercivity caused by the extremely small magnetic anisotropy due to the cubic crystal structure, so that FeCo has long been unsuitable for permanent magnets. However, recent reports have revealed that the transformation of the crystal structure from cubic to tetragonal causes large magnetic anisotropy. In 2017, the author reported that a large coercivity can be obtained by fabricating tetragonal FeCo nanodots. This article reviews recent progress of rear-earth free permanent magnets especially for the tetragonal FeCo based alloys.
本誌: 電気学会論文誌A(基礎・材料・共通部門誌) Vol.141 No.2 (2021) 特集:ナノスケール磁性体の構造・組織解析と創製に関する動向と展望
本誌掲載ページ: 105-111 p
原稿種別: 解説論文/日本語
電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/141/2/141_105/_article/-char/ja/
受取状況を読み込めませんでした
