Atomic structure and domain wall pinning in samarium-cobalt-based permanent magnets.
Atomic structure and domain wall pinning in samarium-cobalt-based permanent magnets.
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DOI：
10.1038/s41467-017-00059-9
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发表时间：
2017-07-04
影响因子：
16.6
通讯作者：
Molina-Luna L
中科院分区：
文献类型：
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作者：
Duerrschnabel M;Yi M;Uestuener K;Liesegang M;Katter M;Kleebe HJ;Xu B;Gutfleisch O;Molina-Luna L
通过增加铁含量获得更高的饱和磁化强度对于在稀土Sm2Co17型钉扎控制永磁体中产生更大的能量积是必不可少的。由于其固有的耐腐蚀性和温度稳定性，这些对于高温工业应用非常重要。在这里，我们提出了一个模型磁铁铁含量增加的基础上，一个独特的纳米结构和化学改性路线，使用铁，铜，锆作为掺杂剂。铁含量控制着菱形蜂窝状结构的形成，该菱形蜂窝状结构支配着畴壁钉扎位点的密度和强度，从而支配着结晶度。使用超高分辨率的实验和理论方法，我们揭示了单相的原子结构，并建立了与宏观磁性的直接相关性。随着进一步的发展，这些知识可以应用于生产具有改善磁性能的钐钴永磁体。了解决定永磁体性能的因素，这些因素在许多工业应用中发挥着核心作用，可以帮助提高其性能。在这里，作者研究了铁含量的变化如何影响钐钴磁体的微观结构。
A higher saturation magnetization obtained by an increased iron content is essential for yielding larger energy products in rare-earth Sm2Co17-type pinning-controlled permanent magnets. These are of importance for high-temperature industrial applications due to their intrinsic corrosion resistance and temperature stability. Here we present model magnets with an increased iron content based on a unique nanostructure and -chemical modification route using Fe, Cu, and Zr as dopants. The iron content controls the formation of a diamond-shaped cellular structure that dominates the density and strength of the domain wall pinning sites and thus the coercivity. Using ultra-high-resolution experimental and theoretical methods, we revealed the atomic structure of the single phases present and established a direct correlation to the macroscopic magnetic properties. With further development, this knowledge can be applied to produce samarium cobalt permanent magnets with improved magnetic performance. Understanding the factors that determine the properties of permanent magnets, which play a central role in many industrial applications, can help in improving their performance. Here, the authors study how changes in the iron content affect the microstructure of samarium cobalt magnets.