Electrically tunable moiré magnetism in twisted double bilayers of chromium triiodide

Abstract

Moiré superlattices in van der Waals structures can be used to control the electronic properties of the material and lead to emergent correlated and topological phenomena. Its first demonstration in van der Waals magnets exhibited noncollinear states and domain structures with, however, limited manipulation. Here we report electrically tunable moiré magnetism in twisted double bilayers - that is, a bilayer plus a bilayer with a twist angle between them - of layered antiferromagnet CrI3. Using magneto-optical Kerr effect microscopy, we observe the coexistence of antiferromagnetic and ferromagnetic order with nonzero net magnetization - a hallmark of moiré magnetism. Such magnetic state extends over a wide range of twist angles (with transitions at around 0° and above 20°) and exhibits a nonmonotonic temperature dependence. We further demonstrate voltage-assisted magnetic switching. The observed nontrivial magnetic states and unprecedented control by twist angle, temperature and electrical gating are supported by the simulated phase diagram of the moiré magnetism.

References in corpus (12)

• Magnetic 2D materials and heterostructures
• Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
• Observation of topological polaritons and photonic magic angles in twisted van der Waals bi-layers
• Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
• Photonic crystals for nano-light in moiré graphene superlattices
• Atomically Thin CrCl3: An in-Plane Layered Antiferromagnetic Insulator
• Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators
• Gate-controllable magneto-optic Kerr effect in layered collinear antiferromagnets
• Twist engineering of the two-dimensional magnetism in double bilayer chromium triiodide homostructures
• Moiré skyrmions and chiral magnetic phases in twisted CrX${}_3$ (X $=$ I, Br, Cl) bilayers
• Evidence of Noncollinear Spin Texture in Magnetic Moiré Superlattices
• Increased Curie temperature and enhanced perpendicular magneto anisotropy of Cr2Ge2Te6/NiO heterostructure

Cited by in corpus (16)

• Progress and Prospects in Two-Dimensional Magnetism of van der Waals Materials
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• Magnetic Anisotropy in Two-dimensional van der Waals Magnetic Materials and Their Heterostructures: Importance, Mechanisms, and Opportunities
• Programmable Magnetic Hysteresis in Orthogonally-Twisted Two-Dimensional CrSBr Magnets via Stacking Engineering
• Macroscopic Tunneling Probe of Moiré Spin Textures in Twisted CrI${}_3$
• Moire magnetism in CrBr3 multilayers emerging from differential strain
• Roadmap on Quantum Magnetic Materials
• Robust polaritons in magnetic monolayers of CrI3
• Magnetic and ferroelectric phase diagram of twisted CrI${}_3$ layers
• Twist Engineering of Anisotropic Excitonic and Optical Properties of a Two-Dimensional Magnetic Semiconductor
• Deep learning methods for Hamiltonian parameter estimation and magnetic domain image generation in twisted van der Waals magnets
• Magnetic Moiré Systems: a review
• Interlayer superexchange in bilayer chromium trihalides
• Emergent giant topological Hall effect in twisted Fe3GeTe2 metallic system
• Moiré spintronics: Emergent phenomena, material realization and machine learning accelerating discovery
• Moiré magnetism in a bilayer Ising model