Tb nanoparticles doped Nd–Fe–B sintered permanent magnet with enhanced coercivity
Tb nanoparticles doped Nd–Fe–B sintered permanent magnet with enhanced coercivity
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DOI：
10.1063/1.3093818
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发表时间：
2009-03
影响因子：
4
通讯作者：
M. Yue;W. Liu;Dongtao Zhang;Z. Jian;Aili Cao;J. Zhang
中科院分区：
文献类型：
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作者：
M. Yue;W. Liu;Dongtao Zhang;Z. Jian;Aili Cao;J. Zhang
研究了掺铽（Tb）纳米颗粒烧结Nd-Fe-B永磁体的显微结构和磁性能。研究表明，Tb以Tb_2Fe_（14）B和/或（Nd，Tb）_2Fe_（14）B相的形式富集在Nd_2Fe_（14）B基体颗粒的表面区域，这表明磁体的磁晶各向异性场显著增强。此外，具有高晶体各向异性的富Tb晶粒表面区域在退磁过程中增加了反向畴的成核场。因此，掺杂少量Tb纳米颗粒的磁体在不牺牲其磁化强度的情况下具有增强的磁性。
The microstructure and magnetic properties were studied for the sintered Nd–Fe–B permanent magnet doped with terbium (Tb) nanoparticles. Investigation shows that Tb is enriched as Tb2Fe14B and/or (Nd,Tb)2Fe14B phase in the surface region of the Nd2Fe14B matrix grains indicated by the remarkable enhancement in the magnetocrystalline anisotropy field of the magnet. Furthermore, the Tb-rich grain surface region with high crystal anisotropy increases the nucleation field of reverse domains in the demagnetization process. As a result, the magnet doped with a small amount of Tb nanoparticles possesses enhanced coercivity without sacrificing its magnetization.