期刊
NANO LETTERS
卷 20, 期 2, 页码 868-873出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03453
关键词
Magnetic skyrmions; van der Waals materials; Fe3GeTe2; Lorentz transmission electron microscopy
类别
资金
- National Key R&D Program of China [2017YFA0303202, 2017YFA0206303]
- National Natural Science Foundation of China [11604148, 11874410]
- Beijing Natural Science Foundation [Z190009]
Two-dimensional (2D) van der Waals (vdW) magnetic materials have recently been introduced as a new horizon in materials science, and they enable potential applications for next-generation spintronic devices. Here, in this communication, the observations of stable Bloch-type magnetic skyrmions in single crystals of 2D vdW Fe3GeTe2 (FGT) are reported by using in situ Lorentz transmission electron microscopy (TEM). We find the ground-state magnetic stripe domains in FGT transform into skyrmion bubbles when an external magnetic field is applied perpendicularly to the (001) thin plate with temperatures below the Curie temperature T-c. Most interestingly, a hexagonal lattice of skyrmion bubbles is obtained via field-cooling manipulation with magnetic field applied along the [001] direction. Owing to their topological stability, the skyrmion bubble lattices are stable to large field-cooling tilted angles and further reproduced by utilizing the micromagnetic simulations. These observations directly demonstrate that the 2D vdW FGT possesses a rich variety of topological spin textures, being of great promise for future applications in the field of spintronics.
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