![]() Therefore, CrCl 3 is located close to the boundary between PMA and in-plane anisotropy, suggesting that its magnetic properties may be particularly susceptible to external perturbations. In particular, the single-ion anisotropy from spin-orbit coupling (SOC) of Cr and the anisotropic exchange from SOC of Cl nearly cancel out each other 20, 21. In contrast, FL CrCl 3 is an easy-plane interlayer antiferromagnet, where spins prefer to lie in the layers 20, 21. The interlayer antiferromagnetic coupling is ascribed to the exchange interactions between Cr mediated by ligand atoms 17, 20. Typically, the few-layer (FL) CrI 3 is an antiferromagnet with Ising-like perpendicular magnetic anisotropy (PMA) 19, 20, as schematically depicted in Fig. The studies of layered semiconducting chromium trihalides have shown exotic magnetic behaviors and rich tunability by stimuli 14, 15, 16, 17, 18. It is also of fundamental significance to effectively control the exchange interactions and magnetic anisotropy, with the latter being crucial to stabilize the long-range magnetic orders. A largely unexplored arena is to combine two different magnetic orders and investigate the magnetic proximity at the interface, which could allow modulation of magnetic interactions and establish exotic magnetic properties. ![]() Magnetic vdW heterostructures provide a new toolbox to explore magnetic proximity and related effects 4, 5, 6, 7, 8, 9, 10. The recently explored van der Waals (vdW) magnets have pushed the research frontier to 2D magnetism where exotic magnetic ground states and quantum phases can emerge 11, 12, 13, 14, 15, 16, 17, 18. One well-known example is the integration of two insulating complex oxides leading to a conducting two-dimensional electron gas at the interface 2, with surprising coexistence of superconductivity and ferromagnetism 3. Heterostructures are promising to host emergent phenomena and device functions not present in constituent parts 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. ![]()
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