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Heterostructures of two-dimensional (2D) van der Waals (vdW) magnets andtopological insulators (TI) are of substantial interest as candidate materialsfor efficient spin-torque switching, quantum anomalous Hall effect, and chiralspin textures. However, since many of the vdW magnets have Curie temperaturesbelow room temperature, we want to understand how materials can be modified tostabilize their magnetic ordering to higher temperatures. In this work, weutilize molecular beam epitaxy to systematically tune the Curie temperature($T_C$) in thin film Fe$_3$GeTe$_2$/Bi$_2$Te$_3$ from bulk-like values($\sim$220 K) to above room temperature by increasing the growth temperaturefrom 300 $^\circ$C to 375 $^\circ$C. For samples grown at 375 $^\circ$C,cross-sectional scanning transmission electron microscopy (STEM) reveals thespontaneous formation of different Fe$_m$Ge$_n$Te$_2$ compositions (e.g.Fe$_5$Ge$_2$Te$_2$ and Fe$_7$Ge$_6$Te$_2$) as well as intercalation in the vdWgaps, which are possible origins of the enhanced Curie temperature. Thisobservation paves the way for developing various Fe$_m$Ge$_n$Te$_2$/TIheterostructures with novel properties.

Tuning the Curie temperature of a 2D magnet/topological insulator heterostructure to above room temperature by epitaxial growth