自形成纳米多层膜的微观结构及磁性耦合机理

项目名称： 自形成纳米多层膜的微观结构及磁性耦合机理

项目编号： No.51271009

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 于荣海

作者单位： 北京航空航天大学

项目金额： 80万元

中文摘要： 本项目拟以所发现的具有自形成纳米双相层状结构的磁性合金为研究对象。理论和实验相结合，分析和调整可自形成纳米双相层状结构合金的成份、制备工艺参数、及外界条件的影响因素，实现自形成纳米双相层状结构材料的可重复性制备；结合钢中珠光体形成机理和扩散型相变理论，分析纳米双相晶粒结构向纳米双相层状结构转变的主要影响因素，探索纳米双相层状结构自形成条件和机理；观察和分析材料的微观组织结构、界面结构、晶体缺陷、和磁畴结构，建立各种结构参数和磁性能之间的关系；调节自形成纳米双相层状结构的相层相对厚度和界面结构，分析材料的交换长度、畴壁厚度、单畴临界尺寸，以及磁参数，研究层状结构的永磁、软磁相等性能与材料的尺寸（厚度）的关系；分析和探讨自形成纳米双相层状结构的磁性交换耦合机制和矫顽力机制，发展适于解释纳米双相层状结构磁性交换耦合作用的理论模型，并藉此指导新型纳米层状结构磁性材料的设计和制备。

中文关键词： 磁性材料；纳米复合；多层膜；磁性耦合；微观结构

英文摘要： The project is proposed to investigate the magnetic materials with self-formed multilayers of two phases. Experiments combined with theoretical prediction would be conducted to adjust chemical composition, process parameters, and other factors, and finally to realize repeatable preparation of self-formed multilayer's structures. Based on diffusion model of phase transformation, the transition from nano-grain microstructure to multilayer microstructure, and mechanism of formation of multilayer structure would be tried to clarified. The mictrostructure, layer's boundary, crystalline defects, and domain size would considered to relate to magnetic properties of the materials. The mechanism of magnetic exchange coupling in nano-meter range and mechanism of coercivity would be theoretically and experimentally investigated, and finally new models would be tried to propose to explain the underlying physics of magnetic exchange coupling in multilayer's structure. The new models will be modified and considered to instruct the design and preparation of new magnetic materials with layer microstructure.

英文关键词： magnetic materials；nano-composite；multilayer；exchange coupling；microstructure