Exploring and controlling topological textures such as merons and skyrmions has attracted enormous interests from the perspective of fundamental research and spintronic applications. It has been predicted theoretically and proved experimentally that the lattice form of topological meron-skyrmion transformation can be realized with the requirement of external magnetic fields in chiral ferromagnets. However, such topological transition behavior has yet to be verified in other materials. Here, we report real-space observation of magnetic topology transformation between meron pairs and skyrmions in the localized domain wall of ferrimagnetic GdFeCo films without the need of magnetic fields. The topological transformation in the domain wall of ferrimagnet is introduced by temperature-induced spin reorientation transition (SRT) and the underlying mechanism is revealed by micromagnetic simulations. The convenient electric-controlling topology transformation and driving motion along the confined domain wall is further anticipated, which will enable advanced application in magnetic devices.

从基础研究和自旋电子应用的角度，探索和控制诸如梅隆和斯格明子等拓扑结构引起了极大的兴趣。理论预测和实验证明，拓扑meron-skyrmion变换的晶格形式可以在手性铁磁体中通过外部磁场的要求来实现。然而，这种拓扑跃迁行为尚未在其他材料中得到验证。在这里，我们报告了亚铁磁 GdFeCo 薄膜局部畴壁中亚子对和斯格明子之间的磁性拓扑变换的实空间观察，而无需磁场。亚铁磁体畴壁中的拓扑变换是通过温度诱导的自旋重定向转变 (SRT) 引入的，其潜在机制通过微磁模拟得到揭示。进一步预期方便的电控拓扑变换和沿受限畴壁的驱动运动，这将使磁性器件的高级应用成为可能。