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Influence of Magnetic Sublattice Ordering on Skyrmion Bubble Stability in 2D Magnet Fe5GeTe2
ACS Nano ( IF 15.8 ) Pub Date : 2024-07-08 , DOI: 10.1021/acsnano.4c00853
Max T Birch 1, 2 , Fehmi S Yasin 2, 3 , Kai Litzius 1 , Lukas Powalla 4 , Sebastian Wintz 5 , Frank Schulz 1 , Alexander E Kossak 6 , Markus Weigand 5 , Tanja Scholz 4 , Bettina V Lotsch 4, 7 , Gisela Schütz 1 , Xiuzhen Z Yu 2 , Marko Burghard 4
Affiliation  

The realization of above room-temperature ferromagnetism in the two-dimensional (2D) magnet Fe5GeTe2 represents a major advance for the use of van der Waals (vdW) materials in practical spintronic applications. In particular, observations of magnetic skyrmions and related states within exfoliated flakes of this material provide a pathway to the fine-tuning of topological spin textures via 2D material heterostructure engineering. However, there are conflicting reports as to the nature of the magnetic structures in Fe5GeTe2. The matter is further complicated by the study of two types of Fe5GeTe2 crystals with markedly different structural and magnetic properties, distinguished by their specific fabrication procedure: whether they are slowly cooled or rapidly quenched from the growth temperature. In this work, we combine X-ray and electron microscopy to observe the formation of magnetic stripe domains, skyrmion-like type-I, and topologically trivial type-II bubbles, within exfoliated flakes of Fe5GeTe2. The results reveal the influence of the magnetic ordering of the Fe1 sublattice below 150 K, which dramatically alters the magnetocrystalline anisotropy and leads to a complex magnetic phase diagram and a sudden change of the stability of the magnetic textures. In addition, we highlight the significant differences in the magnetic structures intrinsic to slow-cooled and quenched Fe5GeTe2 flakes.

中文翻译:


磁性亚晶格排序对二维磁体 Fe5GeTe2 中斯格明子气泡稳定性的影响



在二维(2D)磁体 Fe 5 GeTe 2中实现上述室温铁磁性代表了范德华(vdW)材料在实际自旋电子应用中使用的重大进步。特别是,对该材料剥离薄片内磁性斯格明子和相关状态的观察,为通过二维材料异质结构工程微调拓扑自旋纹理提供了一条途径。然而,关于Fe 5 GeTe 2中磁性结构的性质存在相互矛盾的报道。由于对结构和磁性能明显不同的两种类型的 Fe 5 GeTe 2晶体的研究使问题变得更加复杂,这两种晶体的区别在于它们特定的制造过程:它们是从生长温度缓慢冷却还是快速淬火。在这项工作中,我们结合 X 射线和电子显微镜来观察 Fe 5 GeTe 2剥离薄片内磁条畴、类斯格明子 I 型和拓扑平凡的 II 型气泡的形成。结果揭示了 150 K 以下 Fe1 亚晶格磁有序的影响,它极大地改变了磁晶各向异性,导致复杂的磁相图和磁织构稳定性的突然变化。此外,我们强调了缓慢冷却和淬火 Fe 5 GeTe 2薄片固有的磁性结构的显着差异。
更新日期:2024-07-08
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