摘要
通过熔融快淬法制备具有非晶结构的Nd4.5Fe77B18.5合金,在氩气保护下660℃、10 min热处理获得了最佳磁性能的纳米双相复合永磁材料.由于材料具有双相复合纳米结构,磁体内部的微观磁化行为显示出复杂的交互作用.引入一阶回转曲线图谱法(FORC)研究材料的磁化机制和表征内部的交互作用.该材料的FORC图谱显示:纳米双相材料中存在明显的可逆磁化与不可逆磁化,同时两者相互耦合,耦合作用体现在图谱中的负值区域.不可逆磁化磁矩之间存在强烈的交互作用,体现在不可逆磁化峰的向下偏移和不对称性,整体表现出退磁特性,同时在δM曲线中得到证实.
Nano-composite alloy Nd4.5Fe77B18.5 was prepared by melt quench, annealed under Ar gas protection. The best magnetization properties of the sample were attained by annealing at 660℃ for 10 min. The micromagnetic behavior of the sample is much more complex and full of various interactions because of nanostructure and dual phase composition. The first order reversal curves （FORC） diagram was employed to research the magnetization mechanism and characterize inner interactions. The experimental FORC diagram shows that there are apparent reversible magnetization and irreversible magnetization, coupling each other characterized by the negative peak. The asymmetry and migration of the irreversible peak show strong interactions among magnetic moments, and the whole magnet shows demagnetizing effect, which is proved by the δM curve method.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2009年第6期728-732,共5页
Journal of University of Science and Technology Beijing
基金
北京科技大学"422高层次创新人才工程"人才基金资助项目(No.007411)
