Two-Dimensional Itinerant Ising Ferromagnetism in Atomically thin Fe3GeTe2

Abstract

Recent discoveries of intrinsic two-dimensional (2D) ferromagnetism in insulating/semiconducting van der Waals (vdW) crystals open up new possibilities for studying fundamental 2D magnetism and devices employing localized spins. However, a vdW material that exhibits 2D itinerant magnetism remains elusive. In fact, the synthesis of such single-crystal ferromagnetic metals with strong perpendicular anisotropy at the atomically thin limit has been a long-standing challenge. Here, we demonstrate that monolayer Fe3GeTe2 is a robust 2D itinerant ferromagnet with strong out-of-plane anisotropy. Layer-dependent studies reveal a crossover from 3D to 2D Ising ferromagnetism for thicknesses less than 4 nm (five layers), accompanying a fast drop of the Curie temperature from 207 K down to 130 K in the monolayer. For Fe3GeTe2 flakes thicker than ~15 nm, a peculiar magnetic behavior emerges within an intermediate temperature range, which we show is due to the formation of labyrinthine domain patterns. Our work introduces a novel atomically thin ferromagnetic metal that could be useful for the study of controllable 2D itinerant Ising ferromagnetism and for engineering spintronic vdW heterostructures.

12 pages, 4 figures

References in corpus (8)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Ligand-field helical luminescence in a 2D ferromagnetic insulator
• Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2
• Electronic Correlation and Magnetism in the Ferromagnetic Metal Fe3GeTe2
• Disorder-induced microscopic magnetic memory
• Hysteresis loops of magnetic thin films with perpendicular anisotropy
• Mechanism for nonequilibrium symmetry breaking and pattern formation in magnetic films

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• Heisenberg-like critical behavior in the quasi-two-dimensional metallic ferromagnet LaCrSb3
• Exchange-Correlation Functionals in 2D Materials: Applications, Challenges, and Limitations
• Gate-Tunable Superconducting Spin Valve in a van der Waals Ferromagnet/Superconductor/Ferromagnet Trilayer
• Layered CrGe1-xSe3+y with Cr Kagome Lattice and Antiferromagnetic Ordering