标题： 在受限于FeGe和Co/Pt纳米圆盘中的磁涡旋中拓扑电荷的周期性转变 显示英文标题

标题： Periodic transitions of topological charge in skyrmions confined within FeGe and Co/Pt nanodisks

摘要： 动态控制自旋子的性质，如极性、涡旋性和拓扑电荷，在其在自旋电子学应用中的实现中至关重要。 在本工作中，我们研究了两种不同系统中的拓扑电荷周期性反转：FeGe，一种体手性磁体，以及 Co/Pt，一种具有强Dzyaloshinskii-Moriya相互作用的界面系统。 通过施加垂直于薄膜平面的振荡磁场，我们诱导了自旋结构的循环转变。 在FeGe中，自旋子通过一个$Q=1 \rightarrow 0 \rightarrow -1$序列经过中间的自旋子态演化。 在Co/Pt中，该过程涉及自旋子的湮灭和再形成，导致拓扑电荷的交替变化。 这些结果揭示了拓扑电荷调制的不同动态机制，为自旋子基器件的节能控制提供了潜在路径。 显示英文摘要

摘要： The dynamic control of skyrmion properties such as polarity, vorticity, and topological charge is crucial for their implementation in spintronic applications. In this work, we investigate the periodic inversion of the topological charge in two distinct systems: FeGe, a bulk chiral magnet, and Co/Pt, an interfacial system with strong Dzyaloshinskii-Moriya interaction. By applying an oscillating magnetic field perpendicular to the film plane, we induce cyclic transitions in the spin texture. In FeGe, the skyrmion evolves through a $Q=1 \rightarrow 0 \rightarrow -1$ sequence via an intermediate skyrmionium state. In Co/Pt, the process involves skyrmion annihilation and re-nucleation, resulting in alternating topological charges. These results reveal distinct dynamic mechanisms for topological charge modulation, offering potential pathways for the energy-efficient control of skyrmion-based devices.