界面动态磁电效应的研究

Magnetoelectric effect, implying coexistence and strong coupling between ferroelectric and magnetic properties, bears the great potential for a wide range of qualitatively new concepts in spintronic devices, as for instance multistate memory devices with fast low-power heterogeneous read/write capability. In this project, we will focus on the magnetoelectric dynamics at ferromagnetic(FM)/dielectric interface. Through exploring proximity and magnetoelectric properties between dissimilar FM/dielectric heterostructures with possible enhanced multiferroicity at room temperature, several mechanisms may underlay the magnetoelectric effect, for example interfacial charge rearrangements, strain effects, and exchange interaction are studied as the key ingredients for interfacial multiferroic. To further characterize the magnetoelectric effects, (ultra-)fast multiferroic dynamics and multi-field-controllable magnetotransport properties will be theoretically addressed as well. Hence, in addition to the relevance for very promising steps towards the fabrication of multiferroic devices, an attractive feature of studying interfacial magnetoelectric effects is that it may reveal extra information and have insight into the underlying charge-spin-orbit coupling mechanisms.

磁电效应，因电/磁有序的共存及相互之间的强耦合，为未来高位、低能耗、多场可控自旋电子学器件的实现和应用提供了广阔的前景。本项目以界面磁电效应的动态性质为目标，通过对复合多铁性异质结构界面性质的细致分析，探索（静电屏蔽、应力、交换作用等）界面效应主导磁电耦合的微观机制及其动力学响应特性，开展多铁性动力学与多场可控磁电输运的理论研究。通过这些研究，期望对电荷-自旋-轨道等多物理自由度之间的相互作用有更为深入的理解和认识，为多场可控自旋电子学器件的发展提供重要的理论参考。

磁电效应，因电/磁有序的共存及相互之间的强耦合，为高位、超低能耗、多场可控自旋电子学器件的实现和应用提供了广阔的前景。项目围绕“界面动态磁电效应”的研究方案，系统地开展了磁电耦合微观机理及其动力学响应特征的理论和实验方面的探索研究，建立和完善了界面磁电耦合的微观机理并获得了相关实验的定量直接支持。揭示了一类磁子激发主导的新型长程磁电直接耦合效应，籍此实现了对磁动力学的完全电场调控，为多场控制的高频磁电材料、高性能吸波隐身材料、和光学超材料的发展提供了可靠的物理基础。在项目执行期间培养（毕业）博士研究生4人，硕士研究生5人；发表SCI论文28篇；获批两项国际合作项目。