Cell-boundary-structure controlled magnetic-domain-wall-pinning in 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets
Cell-boundary-structure controlled magnetic-domain-wall-pinning in 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets
复制标题
2:17 型 Sm-Co-Fe-Cu-Zr 永磁体中细胞边界结构控制的磁畴壁钉扎
DOI：
10.1016/j.matchar.2020.110575
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发表时间：
2020-11-01
影响因子：
4.7
通讯作者：
Ma, Tianyu
中科院分区：
文献类型：
--
作者：
Song, Xin;Liu, Yao;Ma, Tianyu
提高Fe含量对于在纳米单元结构的2：17型Sm-Co-Fe-Cu-Zr合金中实现大的磁化强度和高的能量积是必不可少的，所述纳米单元结构的2：17型Sm-Co-Fe-Cu-Zr合金是先进高温应用中最突出的永磁体。然而，为什么具有完整纳米单元结构的富铁磁体的最大能量积仍然远低于理想值，这仍然是一个谜。在这里，我们进行了比较研究之间的Sm-Co-Fe-Cu-Zr磁体的Fe含量为16.2wt%和19.5wt%，具有类似的菱形胞边界，但不同的磁性能。与Fe-16.2wt%磁体中大多数晶胞由1：5 H晶胞边界分开不同，Fe-19.5wt%磁体中的一些晶胞由2：17 R '型（无序菱面体相）晶胞边界分开。与显示出强吸引畴壁钉扎的1：5 H单元边界不同，2：17 R '单元边界产生排斥钉扎，导致较差的方形度以及低于理想的最大能量积。随着研究的进一步深入，Fe含量对Sm-Co-Fe-Cu-Zr永磁体胞间结构和钉扎类型的控制作用将有助于提高富Fe永磁体的磁性能。
Raising Fe content is essential to achieve large magnetization and high energy product in the nanocell structured 2:17-type Sm-Co-Fe-Cu-Zr alloys - the most prominent permanent magnets for advanced high temperature applications. However, it remains a mystery why the Fe-rich magnets with complete nanocell structure still have a maximum energy product much lower than the ideal value. Here we performed a comparative investigation between two Sm-Co-Fe-Cu-Zr magnets with Fe contents of 16.2 wt% and 19.5 wt%, having similar diamond-shaped cell boundaries but distinct magnetic properties. Unlike the Fe-16.2 wt% magnet that most cells are separated by 1:5H cell boundaries, some cells in the Fe-19.5 wt% magnet are separated by the 2:17R'-type (disordered rhombohedral phase) cell boundaries. Unlike the 1:5H cell boundaries that show strong attractive domain-wall-pining, the 2:17R' cell boundaries yield repulsive pinning, leading to poor squareness as well as the lower-than-ideal maximum energy product. With further development, the knowledge that Fe content controls the cell boundary structure and pinning type may help to improve the magnetic performance of Fe-rich Sm-Co-Fe-Cu-Zr permanent magnets.