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Two-dimensional (2D) van der Waals (vdW) magnetic materials have recentlybeen introduced as a new horizon in materials science and enable the potentialapplications for next-generation spintronic devices. Here, in thiscommunication, the observations of stable Bloch-type magnetic skyrmions insingle crystals of 2D vdW Fe3GeTe2 (FGT) are reported by using in-situ Lorentztransmission electron microscopy (TEM). We find the ground-state magneticstripe domains in FGT transform into skyrmion bubbles when an external magneticfield is applied perpendicularly to the (001) thin plate with temperaturesbelow the Curie-temperature TC. Most interestingly, a hexagonal lattice ofskyrmion bubbles is obtained via field cooling manipulation with magnetic fieldapplied along the [001] direction. Owing to their topological stability, theskyrmion bubble lattices are stable to large field-cooling tilted angles andfurther reproduced by utilizing the micromagnetic simulations. Theseobservations directly demonstrate that the 2D vdW FGT possesses a rich varietyof topological spin textures, being of a great promise candidate for futureapplications in the field of spintronics.

Observation of Magnetic Skyrmion Bubbles in a van der Waals ferromagnet Fe3GeTe2