基于Skyrmion拓扑磁结构的高频磁动态特性机理研究

实现小型化和GHz范围内多频段电磁波响应是当下高频磁性材料体系需要解决的重要问题。目前，用于微波领域的铁磁性薄膜，由于其单一的动态响应模式，制约了磁性材料高频性能的进一步提升。非线性共振是提高动态响应频率的有效手段之一。本项目利用磁Skyrmion全局域性的自旋分布特点，避免单元间交换耦合效应对电磁响应的干扰，进而减小周期尺寸；通过特殊的拓扑磁特性丰富并调节基于斯格明子拓扑磁结构的非一致性共振高频磁响应模式。重点探究本征参数和结构参数对晶体结构、Skyrmion自旋分布、以及电、磁性能的影响规律，建立拓扑磁特性与电磁性能的相互关联机制。本项目的开展将为阐明Skyrmion拓扑磁结构对高频动态特性的作用机理、研发新型拓扑磁结构磁性器件奠定理论和实验基础。

Achieving the miniaturization and the multi-frequency electromagnetic response in GHz band remains a grand challenge for magnetic materials in high frequency applications. Nowadays, ferromagnetic films used in microwave technique are mostly based on the single dynamic response mode. It limits further improvement of the high-frequency properties in magnetic materials. The nonlinear resonance is an effective way for the dynamic response frequency improving. In this project, we propose to use the global-domain distribution of magnetic Skyrmion to avoid the influence of the exchange coupling effect on the electromagnetic response between magnetic elements, and reduce the period size of elements. The non-uniform high frequency magnetic response mode can also be enriched and adjusted by Skyrmion topological magnetic structure. The key points of this research lie in: (1) The influence of intrinsic and structure parameters on crystal structures, spin distribution, electrical properties and magnetism. (2) The related physical mechanisms between topology characteristics and electromagnetic performance. This project will help clarify the mechanisms of the high-frequency magnetic dynamic properties, and also develop a new class of multi-frequency magnetic devices based on topological magnetic structure.