Antiferromagnetic (AFM) skyrmions are envisioned as ideal localized topological magnetic bits in future information technologies. In contrast to ferromagnetic (FM) skyrmions, they are immune to the skyrmion Hall effect, might offer potential terahertz dynamics while being insensitive to external magnetic fields and dipolar interactions. Although observed in synthetic AFM structures and as complex meronic textures in intrinsic AFM bulk materials, their realization in non-synthetic AFM films, of crucial importance in racetrack concepts, has been elusive. Here, we unveil their presence in a row-wise AFM Cr film deposited on PdFe bilayer grown on fcc Ir(111) surface. Using first principles, we demonstrate the emergence of single and strikingly interpenetrating chains of AFM skyrmions, which can co-exist with the rich inhomogeneous exchange field, including that of FM skyrmions, hosted by PdFe. Besides the identification of an ideal platform of materials for intrinsic AFM skyrmions, we anticipate the uncovered knotted solitons to be promising building blocks in AFM spintronics.

反铁磁 (AFM) 斯格明子被设想为未来信息技术中理想的局部拓扑磁位。与铁磁 (FM) 斯格明子相比，它们不受斯格明子霍尔效应的影响，可能提供潜在的太赫兹动力学，同时对外部磁场和偶极相互作用不敏感。尽管在合成 AFM 结构中观察到并且在固有 AFM 散装材料中观察到复杂的亚子纹理，但它们在非合成 AFM 薄膜中的实现（在赛道概念中至关重要）一直难以捉摸。在这里，我们揭示了它们在沉积在 fcc Ir(111) 表面上生长的 PdFe 双层上的逐行 AFM Cr 薄膜中的存在。使用第一性原理，我们证明了 AFM 斯格明子的单个和显着相互穿插的链的出现，它可以与丰富的非均匀交换场共存，包括由 PdFe 托管的 FM skyrmions。除了为本征 AFM 斯格明子确定理想的材料平台外，我们预计未发现的打结孤子将成为 AFM 自旋电子学中有前途的构建模块。