磁性纳米结构对多铁性场效应异质结电控磁性的增强研究

项目名称： 磁性纳米结构对多铁性场效应异质结电控磁性的增强研究

项目编号： No.51272078

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： 高兴森

作者单位： 华南师范大学

项目金额： 78万元

中文摘要： 电场对磁性调控是当前多铁性材料和磁电效应研究领域热点。其中多铁性场效应异质结因可实现电场对磁性的直接调控，在技术上与现有半导体工艺相兼容，在新型低能耗存储和逻辑电路上(如四态存储器、非易失逻辑电路等)有广泛应用前景，而受到诸多关注。然而这种电场影响主要局限在界面层附近原子，其调控能力和可控性还有待提高。如果在异质结中引入磁性纳米结构，可由于尺寸和界面效应进一步影响电场作用的效果。申请人基于以往对纳米磁性实验和理论模拟研究基础，提出利用纳米结构及量子点对其磁电耦合特性进一步调控的设想。拟通过实验和理论相结合的方法，系统研究纳米尺度下微观畴结构、尺寸效应、和界面效应对这类异质结磁电耦合特征及相变行为的影响，深入探索其中磁电耦合机制，并进一步通过纳米材料设计提高其室温下磁电耦合性和可控性。我们希望通过纳米结构对磁结构和相变行为的调节，进一步放大电控磁性效果，以达到器件化需求。

中文关键词： 电控磁性；多铁性；多铁复合材料；铁酸铋；纳米磁畴

英文摘要： Recently, multiferroic field-effect heterostructures have attracted large attentions due to their capabilities of direct controlling magnetic properties by electric field as well their compatibility to semiconductor MOS process, which are promising for new generation memories and logical devices (e.g. electric write and magnetic read data storage, and nonvolatile logical devices). However, for device applications, stable and strong electrical control of magnetic properties are demanded, which still remains a challenge. In this connection, we propose a new method to further enhance their magnetoelectric effects by using nanostructured magnets, taking advantages of their inherit size and surface effects. Our purpose is to explore the effects of nanodomains, size, and surface effects on the magnetoelectric properties of these structures, and their ability of further tailoring their magnetoelectric properties. To get a deep insight into the governing mechanisms, both theoretical simulation and experimental work will be employed. Finally, prototype devices will also proposed based on these investigations.

英文关键词： electric-control of magentism；multiferroic ；Multiferroic composite；BiFeO3；magnetic nanomains