摘要
纳米复合磁体的磁能积能得到大幅度提高,前提是晶粒之间存在良好的交换耦合作用,而交换耦合作用与软、硬磁相之间的界面密切相关。对Nd_2Fe_(14)B、Sm-Co、FePt基纳米复合磁体界面交换耦合和反磁化的研究展开论述。在不同的条件下,界面结构的匹配性、界面原子扩散、晶间的非晶相、界面非磁性层、界面晶格弛豫等可能有利于改善界面的结构、增强交换耦合作用,进而对反磁化过程产生影响。反磁化的不可逆过程主要发生在硬磁相内,但与软、硬磁相界面特性密切相关。不可逆反磁化在一定程度上决定了磁体的矫顽力,它可通过改善界面结构进行调控。本文旨在对纳米复合磁体界面的作用深入理解并期望能对磁体磁性能的优化提供参考。
The energy product could be improved largely in nanostructure magnets owing to the interfacial exchange coupling that is strongly dependent on the interface structure between soft and hard magnetic phases.In this paper,the interface structure,interfacial exchange coupling and magnetization reversal are reviewed in Nd_2Fe_(14) B,Sm-Co and FePt based nanocomposite magnets.The atomically coherence,atomic interdiffusion,amorphous phase,nonmagnetic layer and lattice relaxation at the interface are possibly beneficial to modify the interface structure,improve the exchange coupling in different conditions and further affect the magnetization reversal process.The irreversible magnetization reversal,strongly depending on the nature of interface between hard/soft phases,occurs mainly in hard phases and determines the coercivity,which could be manipulated by modifying the interface structure.It is expected that this review is helpful for understanding fully the effect of interface and for improving the magnetic properties in nanocomposite magnets.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2016年第2期2024-2030,2035,共8页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51461033)
内蒙古科技大学创新基金资助项目(2014QDL041)
关键词
纳米复合磁体
界面结构
交换耦合
原子扩散
反磁化
nanocomposite magnets
interface structure
exchange coupling
atomic interdiffusion
magnetization reversal
