摘要
探讨了微量的Ga替代Fe对Nd2 (Fe,Co) 1 4 B (Fe,Co ) 3B + (少量 )α Fe永磁材料的晶体结构及磁性能的影响 ,并讨论了双相纳米晶磁体性能的变化机理以及所适用的理论模型 .结果表明 ,Ga的添加不仅使晶粒尺寸显著变小 ,而且在Ga含量x <1at%的范围 ,随着x的增加 ,Br 和 (BH) max随退火时间的变化关系由形似马鞍的曲线转化为抛物曲线 ;矫顽力jHc 先下降到一个最小值后再上升 ;当x =0 .2时 。
Effect of the Ga content substituting the Fe on the crystal structure and magnetic properties of the Nd-2 (Fe, CO)(14)B/(Fe, Co)(3) B + (little) alpha -Fe permanent magnetic materials is studied. The change mechanism of magnetic properties of the dual-phase nanocrystalline magnets is discussed. The results show that the crystal size was markedly decreased by adding Ga. With the increase of x, the dependence of the B, and the (BH)(max) on annealing time undergoes a chang from two-peak curves to one-peak curves in the Ga content range of x < 1 at%. The coercive force (j) H-c decreases at first to a minimum and then increases slowly. The best value of the magnetic properties is obtained at x = 0.2.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第8期1600-1604,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号 :5 0 0 710 5 1和 5 990 10 10 )资助的课题&&
关键词
双相纳米晶磁体
快淬
退火
交换耦合
磁性能
永磁材料
dual-phase nanocrystalline magnets
med-spin
annealing
exchange coupling
magnetic properties
