超薄铁电膜的居里温度及其表面效应  

Curie Temperature and Surface Effects of Ultra - Thin Ferroelectric Films

作　　者：凌瑞良[1] 聂鹏飞[2] 

机构地区：[1]常熟高等专科学校,常熟215500 [2]南京大学物理系,南京210071

出　　处：《常熟高专学报》2000年第2期36-39,共4页Journal of Changshu College

摘　　要：采用平均场理论下的横场 Ｉｓｉｎｇ模型，得到同时考虑Ωｓ≠Ω，Ｊｓ≠Ｊ情况下超薄铁电膜的居里温度表达式，进一步研究除发现存在临界表面层隧穿频率．Ωｓｃ外还发现由Ｊｓ／Ｊ＝The Curie temperature expressions of Ultra'- thin ferroelectric films are obtained by using the transverse field Ising model in the mean-field approximation theory under the condition Ωｓ ≠ Ω Js / J. By means of Curie temprerature expressions,the Curie temprerature as functions of n I as well as the values of Js and Ωs for the surface layer has been studied. Finally, the new information of surface effects displayed by the Curie temperature are oblained.

关 键 词：超薄铁电膜 表面效应 横场Ising模型 居里温度 

分 类 号：TM221[一般工业技术—材料科学与工程] O484.4[电气工程—电工理论与新技术]