Effect of Co Content on Microstructures and Magnetic Properties of Anisotropic Bulk TbCu7-type Sm-Co Nanocrystalline Magnets
Effect of Co Content on Microstructures and Magnetic Properties of Anisotropic Bulk TbCu7-type Sm-Co Nanocrystalline Magnets
复制标题
Co含量对各向异性大块TbCu7型Sm-Co纳米晶磁体显微组织和磁性能的影响
DOI：
10.1109/tmag.2019.2946239
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发表时间：
2020-01-01
影响因子：
2.1
通讯作者：
Li, Xiaohong
中科院分区：
文献类型：
--
作者：
Hua, Yingxin;Lou, Li;Li, Xiaohong
以6.37 < x < 8.5的SmCox非晶前驱体为原料，采用高压热压法（HPTC）制备了各向异性的TbCu 7型Sm-Co纳米晶块体磁体，研究了Co含量对磁体显微结构和磁性能的影响。结果表明，Co含量x = 6.37时，前驱体中出现TbCu 7型Sm-Co相和少量CaCu 5型Sm-Co相; x = 6.7 ~ 8.5时，在HPTC过程中只生成单一的TbCu 7型Sm-Co相。当x = 6.37时，形成了明显的（00 l）织构，且随着Co含量的增加，合成磁体的（00 l）织构呈减小趋势。随着Co含量的增加，纳米结构的剩磁B-r和饱和磁化强度M-s显著增加，矫顽力H-ci逐渐减小，在x = 7.25时，最大磁能积（BH）（max）达到峰值19.7 MGOe。并对具体的机理进行了讨论。
The influences of Co content on the microstructures and magnetic properties of the anisotropic bulk TbCu7-type Sm-Co nanocrystalline magnets prepared by high-pressure thermal compression (HPTC) from amorphous SmCox precursors with 6.37 < x < 8.5 had been investigated. We found that with Co content x = 6.37, the TbCu7-type Sm-Co phase and a small amount of CaCu5-type Sm-Co crystallized from the precursors; from x = 6.7 to x = 8.5, only single TbCu7-type Sm-Co phase generated during the HPTC process. When x = 6.37, an obvious (00l) texture was formed, and with increasing Co content, the (00l) texture of the synthesized magnets showed a decreasing trend. With increasing Co content, the remanence B-r and saturation magnetization M-s of the nanostructure significantly increased while the coercivity H-ci gradually decreased, and at x = 7.25, a peak value of the maximum energy product (BH)(max) = 19.7 MGOe was obtained. The detailed mechanism was also discussed.