铁磁材料中磁畴壁、磁化涡旋和磁性斯格明子等拓扑磁结构具有许多新颖的物理特性，在新型自旋电子器件中都有着广泛的应用前景。建立拓扑磁结构演化的多场耦合动力学模型，预测其在外场作用下的演化规律，对相关电子器件的设计和应用具有重要意义。本项目将基于第一性原理计算，确定铁磁材料不同能量随应变和磁化变化的规律，得到相关热力学参数，建立包含惯性项和磁弹耦合的动力学相场模型，研究应变对不同几何构型和电极分布的铁电/铁磁异质结构中拓扑磁结构的影响。通过优化设计铁电/铁磁异质结构的几何构型和电极分布，得到不同模式的压电应变，用于对拓扑磁结构稳定性和动力学特性的调控。基于相场模拟，寻求应变对磁畴壁、磁化涡旋和磁性斯格明子调控规律，探讨应变与拓扑磁结构相互作用的微观机制及其与材料特性之间的关联。最后，本项目将指出调控拓扑磁结构特性的新方法，并进行相关的实验验证，为拓扑磁结构在自旋电子器件中的应用提供科学依据。

Topological magnetic structures such as domain walls, vortices and skyrmions in ferromagnetic materials possess various novel functionalities, which has potential applications in future spintronic devices. For the design and application of the devices, it is crucial to propose a dynamic model with multi-field coupling to predict the evolution of topological magnetic structures subjected to external loads. Based on first-principle calculations, the thermodynamic parameters of the materials will be predicted by calculating the energies with various strains and magnetizations. A dynamic phase field model including magnetoelastic coupling and inertia terms will be established to investigate the strain control of topological magnetic structures in ferroelectric and ferromagnetic heterostructures with different geometries and electrodes. By optimally designing the geometries and electrodes of ferroelectric and ferromagnetic heterostructures, different strains will be generated through piezoelectric effect, which will be employed to tune the stability and dynamic properties of topological magnetic structures. The influence of the strain on the domain walls, vortices and skyrmions in ferromagnetic materials will be investigated, in which the interactions between the strains and topological magnetic structures will be discussed. Finally, the results of the project will suggest new ways to tune the properties of topological magnetic structures. Experiments will be conducted to confirm the prediction, which will provide the theoretical instructions to the application of topological magnetic structures in spintronic devices.