纳米Nd2Fe14B永磁材料的有效各向异性随晶粒尺寸的变化

中国稀土学报, 2004, 22(5): 623-626.

纳米Nd2Fe14B永磁材料的有效各向异性随晶粒尺寸的变化

冯维存 ^1, , 高汝伟 ^2, , 韩广兵 ^3, , 朱明刚 ^4, , 李卫 ^5, , 孙光飞 ^6,

1.山东大学物理与微电子学院,山东,济南,250100;钢铁研究总院功能材料所,北京,100081

2.山东大学物理与微电子学院,山东,济南,250100

3.山东大学物理与微电子学院,山东,济南,250100

4.钢铁研究总院功能材料所,北京,100081

5.钢铁研究总院功能材料所,北京,100081

6.北京科技大学材料学院,北京,100083

基金项目: 国家自然科学基金(50371046) 国家高技术研究发展计划(863计划)(2002AA324050,2002AA302602)

关键词：金属材料 , 有效各向异性 , 晶粒尺寸 , 交换耦合相互作用 , 矫顽力 , 稀土

Dependence of Effective Anisotropy in Nanocrystalline Nd2Fe14B Hard Magnetic Material on Grain Size

以纳米Nd2Fe14B硬磁材料为例, 从Herzer的随机各向异性理论出发, 采用立方体晶粒结构模型, 建立了纳米硬磁性晶粒之间的部分交换耦合模型, 研究了材料的有效各向异性随晶粒尺寸的变化关系.结果表明: 晶粒之间的交换耦合相互作用随晶粒尺寸的减小而增强, 材料的有效各向异性Keff随晶粒尺寸的减小逐渐下降. Keff随晶粒尺寸的变化规律与矫顽力的变化规律基本相似, 纳米Nd2Fe14B硬磁材料矫顽力的下降主要由有效各向异性的减小引起.

参考文献

[1]	Kneller E.F.;Hawig R. .The exchange-spring magnet: a new material principle for permanent magnets[J].IEEE Transactions on Magnetics,1991(4):3588-3560.
[2]	Skomski R;Coey J M D .Giant energy product in nanostractured two-phase magnets[J].Physical Review B,1993,48:15812.
[3]	Herzer G. .Grain size dependence of coercivity and permeability in nanocrystalline ferromagnets[J].IEEE Transactions on Magnetics,1990(5):1397-1402.
[4]	Manaf A;Buckley R A;Davies H A et al.Enhenced magnetic properties in rapidly solidified Nd-Fe-B based alloys[J].Journal of Magnetism and Magnetic Materials,1991,101:360.
[5]	Arcas J.;Barandiaran JM.;Prados C.;Vazquez M.;Marin P. Neuweiler A.;Hernando A. .Soft to hard magnetic anisotropy in nanostructured magnets[J].Physical Review.B.Condensed Matter,1998(9):5193-5196.
[6]	FISCHER R;Schrefl T;Kronmüller H et al.Grain-size dependence of remanence and coercive field of isotropic nanocrystalline composite permanent magnets[J].Journal of Magnetism and Magnetic Materials,1996,153:35.
[7]	GAO Ruwei,FENG Weicun,CHEN Wei,WANG Biao,HAN Guangbing,ZHANG Peng.Exchange-coupling interaction and effective anisotropy in nanocomposite permanent materials[J].科学通报(英文版),2002(14):1166-1169.
[8]	HAN Guangbing;GAO Ruwei;FENG Weicun;LIU Hanqiang;WANG Biao;ZHANG Peng;CHEN Wei;LI Wei;GUO Yongquan .Effective anisotropy and coercivity in nanocrystalline single-phase NdFeB permanent magnetic material[J].Science in China.Series G.Physics, astronomy,2003(4):398-404.
[9]	SUN X K;Zhang J;Chu Y L et al.Dependence of magnetic properties on grain size of α-Fe in nanocomposite(Nd,Dy)(Fe,Co,Nb,B)5.5/α-Fe magnets[J].Applied Physics Letters,1999,74:1740.
[10]	Kronmuller H.;Seeger M.;Zern A.;Fischer R. .MICROMAGNETISM AND MICROSTRUCTURE OF HARD MAGNETIC MATERIALS[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,1996(9):2274-2283.

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材料期刊网

纳米Nd2Fe14B永磁材料的有效各向异性随晶粒尺寸的变化

Dependence of Effective Anisotropy in Nanocrystalline Nd2Fe14B Hard Magnetic Material on Grain Size

参考文献