单相纳米永磁体剩磁的一个普适公式  

A Universal Formula for Remanence of Single-phased Permanent Nanomagnet

作　　者：张庆香[1] 赵国平[1] 鲜承伟[1] 杨春[2] 徐劲松[1] 

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610066 [2]四川师范大学四川省软件重点实验室,四川成都610066

出　　处：《四川师范大学学报（自然科学版）》2010年第4期495-499,共5页Journal of Sichuan Normal University（Natural Science）

基　　金：国家自然科学基金(10747007)资助项目

摘　　要：利用微磁学方法,对解析模型进行适当改进,推导总结出单相纳米永磁材料剩磁的一个普适公式Mr=a+b/L,其中a=Ms/2,b=cWMs,Mr、Ms、W、L分别为剩余磁化强度、饱和磁化强度、畴壁宽度和晶粒线度,c是一无量纲常数.通过拟合实验数据得到公式中a、b值,从而得到单相纳米永磁材料剩磁、剩磁增强效应.A universal formula for remanence of singlephased permanent nanomagnet has been derived by micromagnetic method, which is as Mr=a＋b/L, where a=Ms/2, b=cWMs, Mr,Ms,W and L are the remanence magnetization, saturated magnetization, domain wall width and average grain size, respectively and c is a dimensionless constant. In addition, coefficients a and b have been obtained by fitting the experimental data, so the remanence and the remanence enhancement of permanent nanomagnet materials have been also obtained.

关 键 词：微磁学 剩磁 交换耦合相互作用 单相纳米永磁体 

分 类 号：O048[理学]