摘要
研究了随机分布颗粒系统的尺寸、各向异性、矫顽力和温度之间的关系.从FexCu1-x,Fe/SiO2,Fe/Al2O3颗粒膜实验结果入手,以Néel-Bron理论和Storner-Wohlfartly模型为依据,建立了描述细磁性颗粒矫顽力Hc与颗粒大小d、热力学温度T的函数关系,并得出在粒径小于dm（=18～20 nm）范围内,矫顽力随着颗粒的尺寸的增加而迅速地增大,而在颗粒尺寸大于这个范围,则按照Hc∝1/d规律变化.
It was studied that relation of particle size, anisotropy, and temperature. A relation of coercivity （Hc）, particle size（d）, and temperature（T） was built by according to experimental results of Fe/SiO2, Fe/ Al2O3 and Fe0.3Cu0.7 granular filem,and Néel-Bron theory and the Stoner-Wohlfarth model. It was found that the coercive force is granular films as a function of particle diameter（d）. With increasing the particle size, Hc increases abruptly and attains maximum around din（ = 18-20 nm）,and then decreses as Hc∝ 1/d.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第3期276-280,共5页
Journal of Yunnan University(Natural Sciences Edition)
基金
重庆市教委科学技术研究项目资助(KJ061305)
重庆涪陵师范学院重点学科建设基金资助课题(2003148)
关键词
纳米颗粒尺寸
各向异性
矫顽力
纳米颗粒磁效应
nanoparticles size
anisotropy effects
coercivity force
nanoparticles magnetic effects
