Size and shape effects on Curie temperature of ferromagnetic nanoparticles

作     者：曹玲飞 谢丹 郭明星 H.S. Park T. Fujita 

作者机构：School of Engineering University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Laboratory of CrystallographyDepartment of MaterialsETH-ZürichCH-8093 Zürich Switzerland School of Materials Science and EngineeringCentral South University 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：2007年第17卷第6期

页      面：1451-1455页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070205[理学-凝聚态物理] 08[工学] 0806[工学-冶金工程] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Project(FY2006) supported by the JSPS Postdoctoral Fellowship For Foreign Researches Project supported by the 21st Century COE Program, "Mechanical Systems Innovation," by the Ministry of Education, Culture, Sports, Science and Technology, Japan 

主　　题：纳米粒子 铁磁体 居里温度 尺寸形状效应 

摘      要：A simplified model was developed to describe the Curie temperature suppression of ferromagnetic nanoparticles. Based on a size and shape dependent model of cohesive energy, the critical temperature variations of ferromagnetic nanoparticles were deduced. It is predicted that the Curie temperature of nanoparticles depends on both size and shape conditions, among which the temperature suppression is strongly influenced by the particle size and the shape effect is comparably minor. The calculation values for freestanding nanoparticles are in good agreement with other theoretical model and the experimental results. The model is also potential for predictions for the nanoparticles embedded in different substrates.