Development of "ExchangeCoupled Magnet" based on a new principle- Towards rare-earth free magnet -

基于新原理的“交换耦合磁体”的开发-迈向无稀土磁体-

• 批准号: 23656224
• 负责人: FUKUNAGA Hirotoshi
• 金额: $ 2.58万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656224/
• 关键词: 磁性材料; 保磁力; 交換結合; 反強磁性; 希土類フリー

This investigation proposes the “exchange-coupled magnet”, in which magnetization reversal from the surfaces of a hard grain is prevented by thin ferromagnetic surface layers coupled anti-ferromagnetically with the hard grain. Thecomputer simulation for Nd-Fe-B magnets predicted that the coercivity of the exchangecoupled magnet was 1.5-2 times larger than those without anti-ferromagnetic coupling. In order to achieve such magnets, Cr, Mn, Cy, and V-based alloys were diffused from the surface of rapidly quenched Nd-Fe-B magnet powders into the boundaries between Nd2Fe14Bgrains. However, we have not succeeded to synthesizing such surface layers coupledanti-ferromagneticall with Nd_Fe_B yet

这项研究提出了“交换耦合磁体”，其中通过与硬晶粒反铁磁耦合的薄铁磁表面层来防止硬晶粒表面的磁化反转。Nd-Fe-B 磁体的计算机模拟预测，交换耦合磁体的矫顽力比没有反铁磁耦合的磁体大1.5-2倍。 Cy和V基合金从快速淬火Nd-Fe-B磁体粉末的表面扩散到Nd2Fe14B晶粒之间的边界中，但是，我们尚未成功合成与Nd_Fe_B耦合的反铁磁表面层。

项目成果

Nd-Fe-B 磁石の磁気特性に及ぼす粒界相交換結合の影響

晶界相交换耦合对Nd-Fe-B磁体磁性能的影响

• 发表时间: 2011
• 作者: R. Kinjo;X. Weiming;I. Kawayama;H. Murakami;M. Tonouchi;佐藤匠，片桐崇史，松浦祐司;横井佑司・柳井武志・中野正基・福永博俊
• 通讯作者: 横井佑司・柳井武志・中野正基・福永博俊

Computer Simulation of Magnetic Properties of Dy-less (Nd,Dy)-Fe-B Composite Magnets

无镝 (Nd,Dy)-Fe-B 复合磁体磁性能的计算机模拟

• 发表时间: 2011
• 期刊: Proc. 11th JSST
• 作者: Kohei Kawasaki;Takeshi Yanai;Masaki Nakano and Hirotoshi Fukunaga
• 通讯作者: Masaki Nakano and Hirotoshi Fukunaga

積層型SmCo5/α-Feナノコンポジット磁石の磁気特性に関する計算機解析

叠层SmCo5/α-Fe纳米复合磁体磁性能的计算机分析

• 发表时间: 2012
• 作者: 山本益輝;木村航平; 原田幸弘;喜多隆;松浦祐司;堀川遼，,柳井武志，中野正基，福永博俊
• 通讯作者: 堀川遼，,柳井武志，中野正基，福永博俊

Micromagnetic Simulation of Enhancement of Coercivity in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets

Nd-Fe-B/(Nd,Dy)-Fe-B复合磁体矫顽力增强的微磁模拟

• 发表时间: 2011
• 作者: K. Kawasaki;T. Yanai;M. Nakano and H. Fukunaga
• 通讯作者: M. Nakano and H. Fukunaga

Numerical Study of Enhanced Coercivity of Nd-Fe-B Magnets with Antiferromagnetically Coupled Thin Surface Layers

具有反铁磁耦合薄表面层的 Nd-Fe-B 磁体增强矫顽力的数值研究

• 发表时间: 2013
• 作者: Y. Yokoi;M. Nakano;T. Yanai and H. Fukunaga
• 通讯作者: T. Yanai and H. Fukunaga