Enhancing Curie Temperature for CrTe2-Containing Heterostructures via Interfacial Engineering.

Two-dimensional (2D) van der Waals (vdW) ferromagnetic heterostructures offer a nondestructive strategy for engineering and modifying the magnetic and electronic properties of 2D materials. Realizing large-area, atomically thin 2D vdW ferromagnets with Curie temperature (Tc) above room temperature remains a key challenge due to the limited size, uncontrolled thickness, and suppressed magnetism of existing materials. Here, we report the wafer-scale growth of layer-controlled CrTe2-containing vdW heterostructures via a "high-to-low" temperature growth strategy. This approach enables the precise fabrication of diverse heterostructures with atomically sharp interfaces, controlled layer numbers, and excellent structural uniformity across 4 in. wafers. Systematic characterizations reveal robust proximity-induced interfacial magnetic enhancement, achieving a Tc of up to 300 K in WTe2/6L CrTe2 and PtTe2/6L CrTe2 wafers through large spin-orbit coupling. This work provides a scalable pathway for constructing high-quality 2D magnetic vdW heterostructures and provides a rational design framework for future 2D spintronic devices.