Manipulating the topological properties of spin textures in magnetic materials is of great interest due to the rich physics and promising technological applications of these materials in advanced electronic devices. A spin texture with desired topological properties can be created by magnetic monopole injection, resulting in topological transitions involving changes in the topological charge. Therefore, controlling magnetic monopole injection has paramount importance for obtaining the desired spin textures but has not yet been reported. Here, we report the use of reliably manipulated magnetic monopole injection in the topological transition from stripe domains to skyrmions in an Fe/Gd multilayer. An easily tunable in-plane magnetic field applied to an Fe/Gd multilayer plays a key role in the magnetic monopole injection by modulating the local exchange energy. Our findings facilitate the efficient management of topological transitions by providing an important method for controlling magnetic monopole injection.

由于这些材料在先进电子设备中丰富的物理特性和有前景的技术应用，操纵磁性材料中自旋纹理的拓扑特性引起了人们的极大兴趣。可以通过磁单极注入创建具有所需拓扑性质的自旋纹理，从而导致涉及拓扑电荷变化的拓扑转变。因此，控制磁单极注入对于获得所需的自旋纹理至关重要，但尚未见报道。在这里，我们报告了在 Fe/Gd 多层中从条带域到斯格明子的拓扑转变中使用可靠控制的磁单极注入。应用于 Fe/Gd 多层的易于调节的面内磁场通过调节局部交换能量在磁单极注入中发挥着关键作用。我们的研究结果通过提供控制磁单极注入的重要方法促进了拓扑转变的有效管理。