交换耦合相互作用对纳米晶粒各向异性的影响

计算物理 ›› 2012, Vol. 29 ›› Issue (3): 449-452.

交换耦合相互作用对纳米晶粒各向异性的影响

孙艳

山东理工大学理学院, 淄博, 255049

收稿日期:2011-07-12 修回日期:2011-10-27 出版日期:2012-05-25 发布日期:2012-05-25
作者简介:孙艳(1980-),female,doctor,lecturer,major in magnetic materials,E-mail:sunym@mail.sdu.edu.eu
基金资助:
Supported by the National Natural Science Foundation of China (Granted No.50671055)

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

SUN Yan

School of Science, Shandong University of Technology, Zibo 255049, China

Received:2011-07-12 Revised:2011-10-27 Online:2012-05-25 Published:2012-05-25
Supported by:
Supported by the National Natural Science Foundation of China (Granted No.50671055)

摘要/Abstract

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.

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

Abstract: 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.

Key words: nanomaterials, random anisotropy model, exchange-coupling interaction

中图分类号:

孙艳. 交换耦合相互作用对纳米晶粒各向异性的影响[J]. 计算物理, 2012, 29(3): 449-452.

SUN Yan. Exchange-coupling Effect in Anisotropy of Nano-meter Permanent Materials[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2012, 29(3): 449-452.