Sun Yuhan, Birch Max T, Finizio Simone, Powalla Lukas, Satheesh Sayooj, Priessnitz Tim, Göring Eberhard, Knöckl Ernst, Kastl Christoph, Holleitner Alexander, Kern Klaus, Weigand Markus, Wintz Sebastian, Burghard Marko
Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.
RIKEN Center for Emergent Matter Science, Wako, 351-0198, Japan.
Adv Mater. 2025 Sep;37(37):e2506279. doi: 10.1002/adma.202506279. Epub 2025 Jun 18.
Strain engineering promises to enable manipulation and control of the properties of exfoliated flakes of 2D van der Waals (vdW) ferromagnets for spintronic applications. However, while previous studies of strain effects have focused on global properties, the impact on local magnetic spin textures remains unexplored. Here, manipulation of magnetism in the 2D ferromagnet FeGeTe (FGT) is demonstrated using geometry-induced strain. Employing scanning transmission X-ray microscopy (STXM), the effects of spatially varying strain profiles on the magnetic order of FGT sheets stamped onto micropillar arrays are directly visualized. It is found that the in-plane strain components, with magnitudes <0.5%, locally elevate the Curie temperature of FGT by 10 K, stabilizing magnetic domains near the pillar corners. These domains include skyrmions and higher-order topological spin textures such as skyrmioniums and skyrmion bags. The possibility to locally seed and control topological spin textures via strain opens new avenues for future spin-based information technologies.
应变工程有望实现对二维范德华（vdW）铁磁体剥离薄片特性的操纵和控制，以用于自旋电子学应用。然而，尽管先前关于应变效应的研究集中在全局特性上，但对局部磁自旋纹理的影响仍未得到探索。在此，利用几何诱导应变展示了对二维铁磁体FeGeTe（FGT）磁性的操纵。采用扫描透射X射线显微镜（STXM），直接可视化了空间变化的应变分布对压印在微柱阵列上的FGT薄片磁序的影响。研究发现，面内应变分量大小<0.5%，局部将FGT的居里温度提高了10 K，稳定了柱角附近的磁畴。这些磁畴包括斯格明子以及高阶拓扑自旋纹理，如斯格明子团和斯格明子袋。通过应变局部播种和控制拓扑自旋纹理的可能性为未来基于自旋的信息技术开辟了新途径。
