Development of Dy-less High Coercivity Magnets Using TransitionFrom Amorphous Phase to Crystalline One

• Project/Area Number: 22360128
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Nagasaki University
• Principal Investigator: FUKUNAGA Hirotoshi 長崎大学, 工学研究科, 教授 (10136533)
• Co-Investigator(Kenkyū-buntansha): NAKANO Masaki 長崎大学, 工学研究科, 准教授 (20274623) ; YANAI Takeshi 長崎大学, 工学研究科, 助教 (30404239)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000); Fiscal Year 2012: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2011: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000); Fiscal Year 2010: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
• Keywords: 磁性材料 / 保磁力 / Nd-Fe-B / 結晶化 / 粒界拡散 / マイクロクロマグネティクス / 表面拡散 / マイクロマグネティクス

Research Abstract

Computer simulation about relationship between coercivity of Nd-Fe-B magnet powders and recovery of magnetic anisotropy due to Dy diffusion clarified that the Dy diffusion from coating layers on powder surface is effective in improving the coercivity of isotropic Nd-Fe-B magnet powders with fine grains. The diffusion from a Dy-coating layers into grain boundaries was realized by using the transition from amorphous state to crystalline one at a low temperature and for short time. The coercivity of isotropic Nd-Fe-B magnet powders was improved by approximately 500 kA/m without remarkable reduction of remanence.

Research Products

• [Journal Article] Magnetic properties of Dy-diffused Nd-Fe-B powder prepared by crystallization from amorphous state (2012)
  • Author(s): Hirotoshi Fukunaga, Ikuo Yamamoto, Masaki Nakano, and Takeshi Yanai
  • Journal Title: J. Appl. Phys Volume: 111 Issue: 7
  • DOI: 10.1063/1.3679422
  • NAID: 120006985563
  • Peer Reviewed
• [Journal Article] Numerical Study of Enhanced Coercivity of a Magnetically Hard Grain with Thin Surface Layers Due to Antiferromagnetic Coupling (2012)
  • Author(s): H. Fukunaga, Y. Yokoi, M. Nakano, and T. Yanai
  • Journal Title: IEEE Trans. Magn Volume: 48 Issue: 11 Pages: 3162-5
  • DOI: 10.1109/tmag.2012.2201707
  • NAID: 120006985825
  • Peer Reviewed
• [Journal Article] Magnetic properties of Dy-diffused Nd-Fe-B powder prepared by crystallization from amorphous state (2012)
  • Author(s): I. Yamamoto, M. Nakano, T. Yanai, H. Fukunaga
  • Journal Title: Proc. 22th Int. Workshop on Rare-Earth Permanent Magnets and their Applications Pages: 371-374
  • NAID: 120006985563
• [Journal Article] Effect of Antiferromagnetically Coupled Thin Surface Layers on Coercivity of A Magnetically Hard Grain - Numerical Calculation - (2012)
  • Author(s): Y. Yokoi, M. Nakano, T. Yanai, and H. Fukunaga
  • Journal Title: Proc. 22th Int.Workshop on Rare-Earth PermanentMagnets and their Applications Pages: 341-343
  • NAID: 10030328177
• [Journal Article] Effect of Magnetostatic Interaction on Magnetization Reversal Process in Nd-Fe-B Magnets -Computer Simulation- (2012)
  • Author(s): 福永博俊, 桐野一生,中野正基, 柳井武志
  • Journal Title: Journal of the Japan Institute of Metals and Materials Volume: 76 Issue: 1 Pages: 43-47
  • DOI: 10.2320/jinstmet.76.43
  • NAID: 130004456253
  • ISSN: 0021-4876, 1880-6880, 2433-7501
  • Peer Reviewed
• [Journal Article] Magnetic properties of Dy-diffused Nd-Fe-B powder prepared by crystallization from amorphous state (2012)
  • Author(s): I. Yamamoto, M. Nakano, T. Yanai, H. Fukunaga
  • Journal Title: Proceedings of 22th International Workshop on Rare-Earth Permanent Magnets and their Applications Volume: 1 Pages: 371-374
  • NAID: 120006985563
• [Journal Article] Effect of Antiferromagnetically Coupled Thin Surface Layers on Coercivity of A Magnetically Hard Grain - Numerical Calculation - (2012)
  • Author(s): Y. Yokoi, M. Nakano, T. Yanai, and H. Fukunaga
  • Journal Title: Proceedings of 22th International Workshop on Rare-Earth Permanent Magnets and their Applications Volume: 1 Pages: 341-343
  • NAID: 10030328177
• [Journal Article] Nd-Fe-B磁石の磁化反転過程に及ぼす静磁気相互作用の影響-計算機シミュレーション- (2012)
  • Author(s): 福永博俊, 桐野一生, 中野正基, 柳井武志
  • Journal Title: 日本金属学会誌 Volume: 第76巻第1号 Pages: 43-47
  • NAID: 10030260448
  • Peer Reviewed
• [Journal Article] Coercivity enhancement of Dy-coated Nd-Fe-B flakes by crystallization (2011)
  • Author(s): H. Fukunaga, Y. Sugimoto, M. Nakano, T. Yanai, S. Ohta, M. Itakura, and M. Nishida
  • Journal Title: J. Appl. Phys Volume: 109 Issue: 7 Pages: 07A701-07A701
  • DOI: 10.1063/1.3549604
  • NAID: 120006985114
  • Peer Reviewed
• [Journal Article] Computer Simulation of Enhancement of Coerciviy in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets (2011)
  • Author(s): K. Kawasaki and H. Fukunaga
  • Journal Title: J. Magn. Volume: 16 Issue: 2 Pages: 145-9
  • DOI: 10.4283/jmag.2011.16.2.145
  • NAID: 120006985103
  • Peer Reviewed
• [Journal Article] Computer Simulation of Magnetic Properties of Dy-less (Nd,Dy)-Fe-B Composite Magnets (2011)
  • Author(s): Kohei Kawasaki, Takeshi Yanai, Masaki Nakano and Hirotoshi Fukunaga
  • Journal Title: Proc. 11th JSST Pages: 62-65
  • NAID: 130005033742
• [Journal Article] Coercivity enhancement of Dy-coated Nd-Fe-B flakes by crystallization (2011)
  • Author(s): H.Fukunaga, Y.Sugimoto, M.Nakano, T.Yanai, S.Ohta, M.Itakura, M.Nishida
  • Journal Title: Journal of Applied Physics Volume: 109
  • NAID: 120006985114
  • Peer Reviewed
• [Journal Article] Computer Simulation of the Magnetization Reversal Process in Nd-Fe-B Magnets Controlled by Magnetostatic Interaction (2010)
  • Author(s): Hirotoshi FUKUNAGA, Kazuo KIRINO, Kohei KAWASAKI, Takeshi YANAI, Masaki NAKANO
  • Journal Title: Proc. 21st Int. Workshop Rare-Earth Permanent Magnets and Their Applications Pages: 169-172
• [Journal Article] Microstructure Analysis of High Coercivity PLD-Made Nd-Fe-B Thick-Film Improved by Tb-Coating-Diffusion Treatment (2010)
  • Author(s): M. Ishimaru, M. Itakura, M. Nishida, M. Nakano and H. Fukunaga
  • Journal Title: MATERIALS TRANSACTIONS Volume: 51 Issue: 10 Pages: 1939-1943
  • DOI: 10.2320/matertrans.M2010189
  • NAID: 10026695701
  • ISSN: 1345-9678, 1347-5320
  • Peer Reviewed
• [Journal Article] Computer Simulation of Magnetic Properties of Dy-less (Nd,Dy)-Fe-B Composite Magnets (2010)
  • Author(s): Kohei Kawasaki, Takeshi Yanai, Masaki Nakano, Hirotoshi Fukunaga
  • Journal Title: Proceedings of the 11th Joint Symposium of Nagasaki University and Jeju National University on Science and Technology Pages: 62-65
  • NAID: 130005033742
• [Journal Article] Computer Simulation of the Magnetization Reversal Process in Nd-Fe-B Magnets Controlled by Magnetostatic Interaction (2010)
  • Author(s): Hirotoshi FUKUNAGA, Kazuo KIRINO, Kohei KAWASAKI, Takeshi YANAI, Masaki NAKANO
  • Journal Title: Proceedings of the 21st Workshop on Rare-Earth Permanent Magnets and Their Applications Pages: 169-172
• [Journal Article] Microstructure Analysis of High Coercivity PLD-Made Nd-Fe-B Thick-Film Improved by Tb-Coating-Diffusion Treatment (2010)
  • Author(s): M.Ishimaru, M.Itakura, M.Nishida M.Nakano, H.Fukunaga
  • Journal Title: Materials Transactions Volume: 51 Pages: 1939-1943
  • NAID: 10026695701
  • Peer Reviewed
• [Presentation] Numerical Study of Enhanced Coercivity of Nd-Fe-B Magnets with Antiferromagnetically Coupled Thin Surface Layers (2013)
  • Author(s): Y. Yokoi, M. Nakano, T. Yanai and H. Fukunaga
  • Organizer: The 12th Joint MMM/Intermag Conference
  • Place of Presentation: Chicago, USA.
• [Presentation] Enhancement of Coercivity of Isotropic Nd-Fe-B Powder by Dy-Deffusion using Crystallization from Amorphous State (2012)
  • Author(s): I. YAMAMOTO, H. FUKUNAGA, M. NAKANO, T. YANAI
  • Organizer: The 22nd Int. Workshop on Rare-Earth Permanent Magnets and Their Applications
  • Place of Presentation: Nagasaki, Japan.
• [Presentation] Effect of Anti-Ferromagnetically Coupled Thin Surface Layers on Coercivity of A Magnetically Hard Grain - Numerical Calculation - (2012)
  • Author(s): Y. Yokoi, M. Nakano, T. Yanai, and H. Fukunaga
  • Organizer: The 22nd Int. Workshop on Rare-Earth Permanent Magnets and Their Applications
  • Place of Presentation: Nagasaki. Japan
• [Presentation] Enhancement of Coercivity of A Magnetically Hard Grain due to Anti-ferromagnetically Coupled Thin Surface Layers -Numerical Calculation - (2012)
  • Author(s): Yuji YOKOI, Hirotoshi FUKUNAGA, MasakiNAKANO, Takeshi YANAI
  • Organizer: IEEE Int.Magn. Conf.
  • Place of Presentation: Vancouver, CANADA
• [Presentation] 反強磁性結合した強磁性表面薄層を有する硬磁性結晶の保磁力 -計算機解析- (2012)
  • Author(s): 横井佑司,中野正基,柳井武志,福永博俊
  • Organizer: 平成24年電気学会基礎・材料・共通部門大会
  • Place of Presentation: 秋田
• [Presentation] 結晶化を利用してNd-Cuを粒界に拡散した等方性Nd-Fe-B高保磁力フレークの磁気特性 (2012)
  • Author(s): 堀陽平・柳井武志・中野正基・福永博俊
  • Organizer: 第65回電気関係学会九州支部連合大会
  • Place of Presentation: 長崎
• [Presentation] Enhancement of Coercivity of Isotropic Nd-Fe-B Powder by Dy-Deffusion using Crystallization from Amorphous State (2012)
  • Author(s): I. YAMAMOTO, H. FUKUNAGA, M. NAKANO, T. YANAI
  • Organizer: The 22nd International Workshop on Rare-Earth Permanent Magnets and Their Applications
  • Place of Presentation: Nagasaki, Japan
• [Presentation] Effect of Anti-Ferromagnetically Coupled Thin Surface Layers on Coercivity of A Magnetically Hard Grain - Numerical Calculation - (2012)
  • Author(s): Y. Yokoi, M. Nakano, T. Yanai, and H. Fukunaga
  • Organizer: The 22nd International Workshop on Rare-Earth Permanent Magnets and Their Applications
  • Place of Presentation: Nagasaki, JAPAN
• [Presentation] Enhancement of Coercivity of A Magnetically Hard Grain due to Anti-ferromagnetically Coupled Thin Surface Layers - Numerical Calculation - (2012)
  • Author(s): Yuji YOKOI, Hirotoshi FUKUNAGA, Masaki NAKANO, Takeshi YANAI
  • Organizer: IEEE International Magnetics Conference
  • Place of Presentation: Vancouver, CANADA
• [Presentation] 結晶化を利用してNd-Cuを粒界に拡散した等方性Nd-Fe-B高保磁力フレークの磁気特性 (2012)
  • Author(s): 堀 陽平・柳井武志・中野正基・福永博俊
  • Organizer: 平成24年度（第65回）電気関係学会九州支部連合大会
  • Place of Presentation: 長崎
• [Presentation] 硬磁性結晶表面に存在する反強磁性結合薄層の保磁力に及ぼす影響-計算機解析- (2011)
  • Author(s): 福永博俊・横井佑司・中野正基・柳井武志
  • Organizer: 電気学会マグネティックス研究会(永久磁石と応用)
  • Place of Presentation: 日本電気計器検定所(東京)
  • Year and Date: 2011-12-15
• [Presentation] Magnetic properties of Dy-diffused Nd-Fe-B powder prepared by crystallization from amorphous state (2011)
  • Author(s): H.Fukunaga, I.Yamamoto, M.Nakano, T.Yanai
  • Organizer: 56th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Scottsdale, Arizona, USA
  • Year and Date: 2011-11-01
• [Presentation] 非結晶質の結晶化を利用してDyを拡散させたNd-Fe-B磁粉の磁気特性 (2011)
  • Author(s): 山本郁生・柳井武志・中野正基・福永博俊
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 朱鷺メッセ(新潟コンベンションセンター)
  • Year and Date: 2011-09-28
• [Presentation] Nd-Fe-B磁石の磁気特性に及ぼす粒界相交換結合の影響 (2011)
  • Author(s): 横井佑司・柳井武志・中野正基・福永博俊
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 朱鷺メッセ(新潟コンベンションセンター)
  • Year and Date: 2011-09-28
• [Presentation] Micromagnetic Simulation of Enhancement of Coercivity in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets (2011)
  • Author(s): K.Kawasaki, T.Yanai, M.Nakano, H.Fukunaga
  • Organizer: Japan-Taiwan 4 Universities Joint Symposium on Material Science for Next Generation Energy and Nano Science
  • Place of Presentation: 長崎大学文教キャンパス
  • Year and Date: 2011-01-20
• [Presentation] Micromagnetic Simulation of Enhancement of Hc in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets (2011)
  • Author(s): K Kawasaki, H.Fukunaga, et al.
  • Organizer: Japan-Taiwan 4 Universities Joint Symposium on Material Science for Next Generation Energy and Nano Science
  • Place of Presentation: 長崎大学文教キャンパス
  • Year and Date: 2011-01-20
• [Presentation] 硬磁性結晶表面に存在する反強磁性結合薄層の保磁力に及ぼす影響 -計算機解析- (2011)
  • Author(s): 福永博俊・横井佑司・中野正基・柳井武志
  • Organizer: 電気学会マグネティクス研究会
  • Place of Presentation: 東京
• [Presentation] Magnetic properties of Dy-diffused Nd-Fe-B powder prepared by crystallization from amorphous state (2011)
  • Author(s): H. Fukunaga, I. Yamamoto, M. Nakano,and T. Yanai
  • Organizer: 56th Annual Conf. on Magn. Magn. Mater
  • Place of Presentation: Scottsdale, USA
• [Presentation] 非結晶質の結晶化を利用してDyを拡散させたNd-Fe-B磁粉の磁気特性 (2011)
  • Author(s): 山本郁生・柳井武志・中野正基・福永博俊
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟
• [Presentation] Micromagnetic Simulation of Enhancement of Coercivity in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets (2011)
  • Author(s): K. Kawasaki, T. Yanai, M. Nakano and H. Fukunaga
  • Organizer: Japan-Taiwan 4 Universities Joint Symposium on Material Science for Next Generation Energy and Nano Science
  • Place of Presentation: Nagasaki
• [Presentation] Nd-Fe-B 磁石の磁気特性に及ぼす粒界相交換結合の影響 (2011)
  • Author(s): 横井佑司・柳井武志・中野正基・福永博俊
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟
• [Presentation] Computer Simulation of Enhancement of Coerciviy in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets. (2010)
  • Author(s): Kohei Kawasaki, Takeshi Yanai, Masaki Nakano, Hirotoshi Fukunaga
  • Organizer: International Conference of AUMS (ICAUMS2010)
  • Place of Presentation: Jeju Island(韓国)
  • Year and Date: 2010-12-06
• [Presentation] Dyコーティングによる 等方性Nd-Fe-B磁石粉の保磁力改善 (2010)
  • Author(s): 福永博俊, 杉元祐一, 中野正基, 柳井武志
  • Organizer: 電気学会マグネティックス研究会(永久磁石の研究)
  • Place of Presentation: 明治大学駿河台キャンパス
  • Year and Date: 2010-12-02
• [Presentation] Dyレス(Nd,Dy)-Fe-Bコンポジット磁石の磁気特性の計算機シミュレーション (2010)
  • Author(s): 川崎康平・柳井武志・中野正基・福永博俊
  • Organizer: 平成22年度 (第63回) 電気関係学会九州支部連合大会
  • Place of Presentation: 九州産業大学
  • Year and Date: 2010-09-26
• [Presentation] DyコーティングによるNd-Fe-B磁石粉の保磁力の向上 (2010)
  • Author(s): 杉元祐一・柳井武志・中野正基・福永博俊
  • Organizer: 平成22年度 (第63回) 電気関係学会九州支部連合大会
  • Place of Presentation: 九州産業大学
  • Year and Date: 2010-09-26
• [Presentation] Computer Simulation of Magnetic Properties of Dy-less (Nd,Dy)-Fe-B Composite Magnets (2010)
  • Author(s): Kohei Kawasaki, Takeshi Yanai, Masaki Nakano, Hirotoshi Fukunaga
  • Organizer: The 11th Joint Symposium between Nagasaki University and Jeju National University on Science and Technology
  • Place of Presentation: 長崎大学文教キャンパス
  • Year and Date: 2010-06-22
• [Presentation] Computer Simulation of Magnetic Properties of Dy-less (Nd,Dy)-Fe-B Composite Magnets (2010)
  • Author(s): Kohei Kawasaki, Takeshi Yanai, Masaki Nakano and Hirotoshi Fukunaga
  • Organizer: The 11th JSST
  • Place of Presentation: Nagasaki
• [Presentation] Computer Simulation of the Magnetization Reversal Process in Nd-Fe-B Magnets Controlled by Magnetostatic Interaction (2010)
  • Author(s): Hirotoshi FUKUNAGA, Kazuo KIRINO, Kohei KAWASAKI, Takeshi YANAI, Masaki NAKANO
  • Organizer: The 21st Workshop on Rare-Earth Permanent Magnets and Their Applications
  • Place of Presentation: Bled, Slovenia
• [Presentation] Dyレス(Nd,Dy)‐Fe‐Bコンポジット磁石の磁気特性の計算機シミュレーション (2010)
  • Author(s): 川崎康平・柳井武志・中野正基・福永博俊
  • Organizer: 第63回電気関係学会九州支部連合大会
  • Place of Presentation: 福岡
• [Presentation] DyコーティングによるNd-Fe-B磁石粉の保磁力の向上 (2010)
  • Author(s): 杉元祐一・柳井武志・中野正基・福永博俊
  • Organizer: 第63回電気関係学会九州支部連合大会
  • Place of Presentation: 福岡
• [Presentation] (2010)
  • Author(s): 福永博俊,杉元祐一,中野正基,柳井武志,福永博俊,杉元祐一,中野正基,柳井武志
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 東京
• [Presentation] Computer Simulation of Enhancement of Coerciviy in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets (2010)
  • Author(s): Kohei Kawasaki, Takeshi Yanai, Masaki Nakano, Hirotoshi Fukunaga
  • Organizer: In. Conf. AUMS
  • Place of Presentation: Jeju, Korea
• [Book] レアアースの最新技術動向と資源戦略 (2011)
  • Author(s): 福永 博俊(町田憲一監修)
  • Publisher: シーエムシー出版
• [Book] レアアースの最新技術動向と資源戦略(担当部分:1.5節コンポジット磁石における希土類使用量低減技術) (2011)
  • Author(s): 福永博俊, (町田憲一監修)
  • Publisher: シーエムシー出版
• [Remarks]
  • URL: http://www.eee.nagasaki-u.ac.jp/~magnet/index.html
• [Remarks] 長崎大学 工学部 工学科 電気電子工学コース 福永・中野研究室
  • URL: http://www.eee.nagasaki-u.ac.jp/~magnet/index.html
• [Remarks]
  • URL: http://www.eee.nagasaki-u.ac.jp/~magnet/index.html
• [Remarks]
  • URL: http://www.eee.nagasaki-u.ac.jp/~magnet/index.html
• [Patent(Industrial Property Rights)] Nd-Fe-B系磁石及びその製造方法 (2010)
  • Inventor(s): 福永博俊, 中野正基, 柳井武志
  • Industrial Property Rights Holder: 長崎大学
  • Industrial Property Number: 2010-213979
  • Filing Date: 2010-09-24