交换耦合相互作用对纳米晶粒各向异性的影响(英文)  

Exchange-coupling Effect in Anisotropy of Nano-meter Permanent Materials

作　　者：孙艳[1] 

机构地区：[1]山东理工大学理学院,淄博255049

出　　处：《计算物理》2012年第3期449-452,共4页Chinese Journal of Computational Physics

基　　金：Supported by the National Natural Science Foundation of China(Granted No.50671055)

摘　　要：研究纳米磁性材料晶粒间的交换耦合相互作用,提出适合各种耦合条件晶粒界面及表面处各向异性的表达式.结果表明:软、硬磁性相晶粒间的交换耦合相互作用降低了硬磁性相晶粒的各向异性,提高了软磁性相晶粒的各向异性.软硬磁性晶粒的平均各向异性先增加后减小,在某个晶粒尺寸值达到最大值,这种变化趋势与相关的理论及实验结果一致.硬硬磁性晶粒的平均各向异性随晶粒尺寸的变化趋势与相关的实验结果也一致.Exchange-coupling effect in anisotropy constant of nano-meter magnetic materials is investigated. An equation was put forward for anisotropy at grain boundaries. Due to exchange-coupling between magnetically soft and hard grains, anisotropy of hard grain is decreased while that of soft grain is enhanced. The average anisotropy of soft-hard grains, increases rapidly,reaches a maximum and then decreases slowly. It is consistent with related experimental and theoretic results. Calculated average anisotropy of hard grains is consistent with experiment.

关 键 词：纳米永磁材料 随机各向异性模型 交换耦合相互作用 

分 类 号：O482.54[一般工业技术—材料科学与工程] TM273[理学—固体物理]