opportunities for exploring magnetism, and toward spintronic applications in the 2D limit. [7][8][9] Among all the interface engineered heterostructures based on vdW layered systems, magnetic proximity effect is integral to manipulating spintronic, [10][11][12] superconducting, [13][14][15] and topological phenomena. [16][17][18] Magnetic skyrmions have been well studied due to their nontrivial topology, which leads to many interesting fundamental and dynamical properties. [19][20][21] These have been reported mostly for noncentrosymmteric single crystals, [22][23][24] ultrathin epitaxial system, [25,26] and magnetic multilayers. [27][28][29][30][31] Recently Néel-type skyrmions were observed in a vdW ferromagnet interfaced with an oxidized layer [32] or a transition metal dichalcogenide [33] with a control of the skyrmion phase through tuning of the ferromagnet thickness. Furthermore, with a variety of vdW magnets, skrymions phase could be created in their new interfaces with unique properties.Materials hosting multiple skyrmion phases add richness to the field, with an additional degree of freedom in designing Multiple magnetic skyrmion phases add an additional degree of freedom for skyrmion-based ultrahigh-density spin memory devices. Extending the field to 2D van der Waals magnets is a rewarding challenge, where the realizable degree of freedoms (e.g., thickness, twist angle, and electrical gating) and high skyrmion density result in intriguing new properties and enhanced functionality. In this work, a van der Waals interface, formed by two 2D ferromagnets Cr 2 Ge 2 Te 6 and Fe 3 GeTe 2 with a Curie temperature of ≈65 and ≈205 K, respectively, hosting two groups of magnetic skyrmions, is reported. Two sets of topological Hall effect signals are observed below 6s0 K when Cr 2 Ge 2 Te 6 is magnetically ordered. These two groups of skyrmions are directly imaged using magnetic force microscopy, and supported by micromagnetic simulations. Interestingly, the magnetic skyrmions persist in the heterostructure with zero applied magnetic field. The results are promising for the realization of skyrmionic devices based on van der Waals heterostructures hosting multiple skyrmion phases.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202110583.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.