Injection, motion, and interaction of magnetic skyrmions

从基础和应用的角度来看，拓扑对象都很有趣。例如，磁天幕的拓扑性质是由于磁化的缠绕。Skyrmions为基础科学开辟了研究领域，从数学基础到未来数据存储和逻辑设备的拓扑稳定对象的实现。在我们的项目中，我们将研究skyrmion产生、运动和相互作用的基本特性。在设想的空间景观中，我们将对摩天大楼的创造、注入和探测的可能性和动态进行调查。在扩展平面装置中，skyrmions将通过磁场、光刺激或通过磁隧道结产生。然而，重点将是通过磁隧道结产生和读出。在二维图案中，单个的天空轮廓将在电流的作用下沿不同方向横向移动。在不同的时间尺度上，采用先进的时间分辨磁光成像技术来研究相关的动态过程和局限性，从而可以对运动拓扑物体进行识别和精确观察。明确定义的设置将特别允许控制个体skyrmions之间的相互作用，目标是产生奇异的skyrmions并研究它们的动态和湮灭行为。通过进一步控制边界的拓扑结构，我们将测试结合数学、磁光分析和材料工程的基本预测。虽然我们项目的重点在于实验，但我们的目标是实验与理论之间的密切合作。理论上的考虑将有助于预测天幕的行为，并通过操纵几何形状和边界磁化来指导实现对天幕标准拓扑的修改。将提供哪些修改与拓扑相关的见解，哪些修改是可实现的，以及哪些修改会导致对实验的新见解。

Topological objects are of interest from a fundamental and from an application point of view. As an example, magnetic skyrmions owe their topological nature to the winding of the magnetization. Skyrmions open up research areas for fundamental science, building on from fundamentals of mathematics to the realization of topologically stabilized objects for future data storage and logic devices. In our project, we will investigate the fundamental properties of skyrmion generation, movement, and interaction in a playground for magnetic skyrmion bubbles. In the envisioned spatial landscape we will conduct investigations of the possibilities and the dynamics of creation, injection, and detection of skyrmions. In the extended planar device, skyrmions will be created by magnetic field, by optical stimulation, or electrically through magnetic tunnel junctions. However, in focus will be the generation and readout via magnetic tunnel junctions. Within the two-dimensional patterns, individual skyrmions will be laterally shifted along different directions by electrical currents. The related dynamic processes and limitations will be investigated by advanced time-resolved magneto-optical imaging on different time-scales, which allows for the identification and precise observation of the moving topological objects. The well-defined setting will especially allow for the controlled interaction between individual skyrmions with the goal of generating exotic skyrmions and of studying their dynamic and annihilation behavior. By further controlling the topology at the boundaries, we will test fundamental predictions combining mathematics, magneto-optical analysis, and materials engineering. While the focus of our project lies in the experiment, we are aiming at a close collaboration between experiment and theory. Theoretical considerations will help to predict the behavior of skyrmions and give guidance on achieving modifications of the standard topology of skyrmions by manipulations of the geometry and the magnetization of boundaries. Insights will be provided to which modifications are relevant for the topology, which ones are realizable, and which ones lead to novel insights on the experiment.