二维单晶铁电-铁磁复合纳米结构的可控制备、表征及性能研究

项目名称： 二维单晶铁电-铁磁复合纳米结构的可控制备、表征及性能研究

项目编号： No.51502258

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 钞春英

作者单位： 许昌学院

项目金额： 21万元

中文摘要： 鉴于低维单晶多铁异质结纳米复合材料对铁电-铁磁复合材料理论和应用的重要意义和科学价值，本项目以水热/溶剂热法制备二维单晶铁电-铁磁PbTiO3-CoFe2O4异质结纳米结构复合材料为目标，将紧密围绕单晶铁电-铁磁PbTiO3-CoFe2O4纳米结构的可控制备，以单晶单畴的PbTiO3纳米片为铁电体，调节铁电铁磁界面处铁磁体CoFe2O4的晶体生长；利用球差校正电镜等从原子尺度上揭示单晶单畴PbTiO3纳米片对CoFe2O4纳米结构在界面处的生长、尺寸及分布密度等的变化规律，揭示界面异质结构对磁电耦合效应的影响规律；利用振动样品磁强计(VSM)和压电力显微镜(PFM)研究单晶铁电铁磁PbTiO3-CoFe2O4纳米结构复合材料的磁化强度、矫顽场、压电响应等变化，揭示其本征的磁电耦合效应，提出单晶二维铁电铁磁复合材料性能的优化途径，为高效磁电耦合器件的开发提供理论基础和技术支持。

中文关键词： 二维单晶；多铁材料；磁电耦合；铁电极化；异质结构

英文摘要： In view of the fascinating theory and application value of the free-standing and low-dimensional single crystal multiferroic heterostrcuture nanocomposites for the ferroelectric/ferromagnetic composites, this program aims at obtaining two-dimensional single crystal ferroelectric/ferromagnetic PbTiO3-CoFe2O4 heterostructure nanomaterials by hydrothermal/solvothermal method. The program focuses on controllable synthesis of 2D single crystal ferroelectric/ferromagnetic PbTiO3-CoFe2O4 nanostructures with the single-crystal and single-domain PbTiO3 nanoplates as the ferroelectric, which adjust the crystal growth of CoFe2O4 nanostructures on the interface. The aberration-corrected high resolution transmission electron microscope (aberration-corrected HRTEM) is employed to explore the crystal growth, size, and density distribution of CoFe2O4 nanostructures on the interface of 2D single crystal PbTiO3-CoFe2O4, based on which the effect mechanism of the interface heterostrcuture on the magnetoelectric coupling can be revealed. By using the vibrating sample magnetometer (VSM) and piezoelectric force microscopy (PFM), the changes of the magnetization, coercive field and piezoelectric response of the single crystal ferroelectric/ferromagnetic PbTiO3-CoFe2O4 nanostructures are investigated, which can reveal the intrinsic magnetoelectric coupling effect. Furthermore, research findings will put forward the property optimization approaches of the free-standing single-crystal 2D ferroelectric/ferromagnetic composites, offering the theory basis and technical support for the development of the efficient magnetoelectric coupling decices.

英文关键词： 2D single crystal;multiferroic materials;magnetoelectric coupling;ferroelectric polarization;heterostructures