高性能纳米复合永磁材料的模拟计算研究  

Investigation of high-performance hard magnetic properties of nanocomposite permanent magnets by micromagnetic finite element method

作　　者：张宏伟[1] 荣传兵[1] 张绍英[1] 沈保根[1] 

机构地区：[1]中国科学院物理研究所磁学国家重点实验室,北京100080

出　　处：《物理学报》2004年第12期4347-4352,共6页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 2 7410 2 )资助的课题~~

摘　　要：构造了在软磁相基体中析出规则形状硬磁相的各向同性和各向异性纳米复合永磁材料Pr2 Fe1 4B α Fe .利用微磁学的有限元法 ,模拟计算了样品的磁滞回线 .通过对剩磁、矫顽力和最大磁能积与软磁相厚度的关系分析 ,发现在软磁相厚度为 0— 12nm的范围内 ,复合磁体的矫顽力随软磁相厚度的增加而单调下降 ,而最大磁能积则是在适当的矫顽力和剩磁下达到最高 .预计纳米复合Pr2 (Fe ,Co) 1 4B α (Fe ,Co)的各向同性磁体的最大磁能积最高可达 2 4 8kJ m3,而各向异性磁体则高达 784kJ m3.The microstructure with which a hard magnetic phase precipitates from the soft magnetic matrix,is observed in nanocomposite Pr 2Fe 14 B/α-Fe. The magnetic hysteresis loops are simulated by micromagnetic finite element method. The dependence of remanence,coercivity and maximum energy product on the width of soft phase are discussed in detail. Although a single-hard-magnetic-phase behavior is observed,the coercivity decreases monotonically with the increase of soft phase width from 0 to 12 nm. The obtained maximum energy products are 184 and 674 kJ/m 3 for isotropic and anisotropic magnets,respectively.

关 键 词：纳米复合永磁材料 磁能积 矫顽力 磁体 剩磁 磁滞回线 各向同性 微磁学 单调 各向异性 

分 类 号：TM273[一般工业技术—材料科学与工程]