层状磁电复合材料力-电-磁耦合宏微观非线性本构关系与实验表征

Magnetoelectric composite has excellent magneto-electric conversion properties and tends to be miniaturized. It has wide application prospect in high-performance information storage, sensors and microwave spintronic devices. Developing the constitutive theory and characterization of its macro-microscopic multi-field coupling property is important for the design and evaluation of electromagnetic functional devices. This topic is an interdisciplinary issue which involves mechanics, electromagnetism and material science. In this project, a size-dependent multi-field coupling constitutive theory of layered magnetoelectric composite will be established to quantitatively describe its nonlinear behavior and size-effect under the quasi-static state or in microwave frequencies. A magneto-electro-mechanical multi-field coupling loading and measurement platform will be constructed. The systematic static and dynamic measurement techniques will be presented, which can be used to study the interfacial coupling mechanism. An in-situ characterization method for measuring the local magnetoelectric coupling coefficient will be proposed to realize the high throughput characterization of the material. We expect to gain original achievements in the size-dependent multi-field coupling constitutive theory and the macro-microscopic measurement techniques of magnetoelectric composite, which can provide the technique and theoretical guidance for its application in practice.

磁电复合材料具有优异的磁电转换特性，且逐渐趋于小型化，在高性能信息存储、传感器以及微波自旋电子器件等领域有着广泛的应用前景。研究其多场耦合本构理论及宏微观性能表征，对于电磁功能器件的设计和评估有重要意义，内容涉及到力学、电磁学和材料学等多学科的交叉。本项目将建立层状磁电复合材料含尺度效应的多场耦合本构理论，定量描述材料在准静态及微波频段下的多场耦合非线性行为与尺度效应；搭建力-电-磁耦合场及微波场加载与测量平台，形成系统的静动态多场耦合测量技术与表征方法，揭示尺度相关的界面耦合机制；发展原位载荷下材料微区磁电耦合系数测量方法，实现磁电复合材料在多场耦合环境下的高通量表征。通过本项目的开展，期望在磁电复合材料尺度相关的多场耦合本构理论、宏微观性能测量技术与表征方法方面获得原创性成果，为其实际工程应用提供理论与技术指导。

磁电复合材料在高性能信息存储、传感器以及微波自旋电子器件等领域有广泛的应用前景。研究其多场耦合本构理论及宏微观性能实验表征，对于电磁功能器件的设计和评价具有重要意义。本项目建立了层状磁电复合材料多场耦合本构模型，同时考虑界面应变耦合和电荷耦合效应，定量描述了磁电复合材料的多场耦合非线性行为与尺度效应；搭建力-电-磁耦合场及微波场加载与测量平台，研究了多场耦合测量技术与表征方法；自主研制了近场扫描微波显微测量装置，发展了微观尺度原位载荷下材料微区介电常数测量方法。本项目在磁电复合材料的多场耦合本构理论、宏微观性能测量技术方面获得原创性成果，为其实际工程应用提供理论指导。