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Recent discoveries of intrinsic two-dimensional (2D) ferromagnetism ininsulating/semiconducting van der Waals (vdW) crystals open up newpossibilities for studying fundamental 2D magnetism and devices employinglocalized spins. However, a vdW material that exhibits 2D itinerant magnetismremains elusive. In fact, the synthesis of such single-crystal ferromagneticmetals with strong perpendicular anisotropy at the atomically thin limit hasbeen a long-standing challenge. Here, we demonstrate that monolayer Fe3GeTe2 isa robust 2D itinerant ferromagnet with strong out-of-plane anisotropy.Layer-dependent studies reveal a crossover from 3D to 2D Ising ferromagnetismfor thicknesses less than 4 nm (five layers), accompanying a fast drop of theCurie temperature from 207 K down to 130 K in the monolayer. For Fe3GeTe2flakes thicker than ~15 nm, a peculiar magnetic behavior emerges within anintermediate temperature range, which we show is due to the formation oflabyrinthine domain patterns. Our work introduces a novel atomically thinferromagnetic metal that could be useful for the study of controllable 2Ditinerant Ising ferromagnetism and for engineering spintronic vdWheterostructures.

Two-Dimensional Itinerant Ising Ferromagnetism in Atomically thin Fe3GeTe2