纳米复合Nd_2Fe_(14)B/α-Fe磁体中晶粒的随机各向异性  

Random anisotropy in Nd_2Fe_(14)B/α-Fe nanocomposite magnetic material

作　　者：孙建刚[1] 杨武[1] 

机构地区：[1]山东大学物理与微电子学院,山东济南250100

出　　处：《山东大学学报（工学版）》2006年第4期88-90,共3页Journal of Shandong University（Engineering Science）

摘　　要：以Nd2Fe14B/α-Fe为例,研究了球状纳米晶粒尺寸对复合磁性材料有效随机各向异性的影响.结果表明,材料的有效随机各向异性常数〈Keff〉随软磁性晶粒尺寸Ds的增加而减小,随硬磁性晶粒尺寸Dh的增加而增大.要使复合磁性材料获得较大的各向异性(矫顽力),Ds应尽量减小(10 nm左右),Dh尽量增大.为使材料具有高的磁能积,Dh应大于10 nm,Ds在10 nm左右.The effects of grain size on the random anisotropy constant 〈Keff〉 in Nd2Fe14B/α-Fe nanocomposite magnet have been investigated. The results show that 〈Keff〉 of the magnet decreases with the increase of the size of soft magnetic grain （Ds） and the decrease of the size of hard one （Dh）, and if the magnet wants to obtaind bigger random anisotropy, Ds should decrease to 10 nm or so and Dh should increase as far as possible, and if the magnet expects to have higher magnetic energy product, Dh should be bigger than 10 nm and Ds should be 10 nm or so.

关 键 词：有效随机各向异性 纳米晶粒 纳米复合材料 交换耦合相互作用 

分 类 号：TM273[一般工业技术—材料科学与工程]