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Exchange-coupled interfaces are pivotal in exploiting two-dimensional (2D)ferromagnetism. Due to the extraordinary correlations among charge, spin,orbital and lattice degrees of freedom, layered magnetic transition metalchalcogenides (TMCs) bode well for exotic topological phenomena. Here we reportthe realization of wafer-scale Cr2Te3 down to monolayer (ML) on insulatingSrTiO3(111) substrates using molecular beam epitaxy. Robust ferromagnetismemerges in 2D Cr2Te3 ML with a Curie temperature TC = 17 K. Moreover, whenCr2Te3 is proximitized with topological insulator (TI) (Bi,Sb)2Te3, themagnetism becomes stronger -- for 1 ML, TC increases to 30 K, while for 2 ML itboosts from 65 K to 82 K. Our experiments and theory strongly indicate that theBloembergen-Rowland interaction is likely a universal aspect of TC enhancementin TI-coupled magnetic heterostructures. The topological-surface-enhancedmagnetism in 2D TMC enables further exchange coupling physics and quantumhybrid studies, including paving the way to realize interface-modulatedtopological electronics.

Enhanced Ferromagnetism in Monolayer Cr2Te3 via Topological Insulator Coupling