Exceptionally High Saturation Magnetic Flux Density and Ultralow Coercivity via an Amorphous–Nanocrystalline Transitional Microstructure in an FeCo‐Based Alloy
Exceptionally High Saturation Magnetic Flux Density and Ultralow Coercivity via an Amorphous–Nanocrystalline Transitional Microstructure in an FeCo‐Based Alloy
复制标题
FeCo 基合金中的非晶-纳米晶过渡微观结构具有极高的饱和磁通密度和超低矫顽力
DOI：
10.1002/adma.202205863
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发表时间：
2022
影响因子：
29.4
通讯作者：
Wen Wang
中科院分区：
文献类型：
--
作者：
Xuesong Li;Jing Zhou;Laiquan Shen;B. Sun;Haiyang Bai;Wen Wang
软磁材料的高饱和磁通密度（Bs）对于提高现代磁性器件和电机的功率密度是必不可少的。然而，增加Bs总是以牺牲高矫顽力（Hc）为代价，在软磁材料家族中呈现出一般的权衡。在此，提供了上级的综合软磁性能，即，在FeCo基合金中前所未有地结合了高达1.94 T的极高Bs和低至4.3 A m−1的Hc。这种合金是通过成分设计策略获得的，以构建非晶和传统纳米晶合金之间的过渡微观结构，纳米晶体（周围具有< 5 nm大小的类晶体区域）稀疏分散在非晶基体中。这种过渡微结构具有由准位错偶极子湮灭引起的极低的磁各向异性和强的磁交换相互作用，这导致优异的综合磁性能。研究结果为下一代软磁材料的开发提供了有益的指导，这些材料在高频，高效和节能器件中具有应用前景。
High saturation magnetic flux density (Bs) of soft magnetic materials is essential for increasing the power density of modern magnetic devices and motor machines. Yet, increasing Bs is always at the expense of high coercivity (Hc), presenting a general trade‐off in the soft magnetic material family. Here, superior comprehensive soft magnetic properties, i.e., an exceptionally high Bs of up to 1.94 T and Hc as low as 4.3 A m−1 are unprecedentedly combined in an FeCo‐based alloy. This alloy is obtained through a composition design strategy to construct a transitional microstructure between amorphous and traditional nanocrystalline alloys, with nanocrystals (with < 5 nm‐sized crystal‐like regions around) sparsely dispersed in an amorphous matrix. Such transitional microstructure possesses extremely low magnetic anisotropy caused by the annihilation of quasi‐dislocation dipoles, and a strong magnetic exchange interaction, which leads to excellent comprehensive magnetic properties. The results provide useful guidelines for the development of the next generation of soft magnetic materials, which are promising for applications of high‐frequency, high‐efficiency, and energy‐saving devices.