纳米复合永磁体通过晶间界面耦合作用可使两种磁性材料的反磁化行为一致，从而达到磁性增强的目的，两相原子在界面扩散合金化对耦合作用和磁性能有强烈影响。本申请拟以Pr2Fe14B/Ce2Fe14B纳米复合磁体开展研究，两相结构相同，但磁晶各向异性相差很大。研究内容包括：探索通过球磨和退火等方法研究两相合金化的规律，建立界面合金化程度、各向异性梯度与反磁化和矫顽力的关系；通过反磁化的热激活研究界面在不可逆反磁化中的作用，从不可逆反磁化验证界面的合金化程度；探究界面合金化对反磁化过程的形核或钉扎作用的影响；对比复相Pr2Fe14B/Ce2Fe14B磁体的界面磁性耦合效应和单相(PrCe)2Fe14B磁体的磁性平均效应，为探索与界面特性密切相关的交换耦合这一关键科学问题提供依据。本研究还可为包头地区白云鄂博稀土资源综合平衡利用探索途径。

Owing to the intergranular exchange coupling effect magnetization reversals are uniform in nanocomposite magnets, leading to an enhancement in magnetic properties. The alloying at interface due to atomic interdiffusion has a strong effect on exchange coupling and magnetic properties. In this project we do the research on Pr2Fe14B/Ce2Fe14B nanocomposite magnets, in which the two phases are different greatly in magnetocrystalline anisotropy, but the same in structure. The research includes: manipulating the alloying at interface by the methods of high energy ball milling and the following annealing, etc. in sample preparation; investigating the effects of alloying and graded anisotropy on the magnetization reversals and coercivity; studying the role of interface in irreversible magnetization reversal by thermal activation and in return checking the interdiffusion effect at the interface; investigating the alloying affect on reversed domain nucleation or domain wall pinning in magnetization reversal; comparing the exchange coupling effect in Pr2Fe14B/Ce2Fe14B nanocomposites with the average effect in (PrCe)2Fe14B single phase. It is expected to provide the basis for probing into the key science problems about the exchange coupling dependence on the interface nature, and it could possibly pave a practical way to improve the efficiency for integrated exploitation of Bayan Obo rare earth resources.