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Vertical integration of two-dimensional (2D) van der Waals (vdW) materialswith different quantum ground states is predicted to lead to novel electronicproperties that are not found in the constituent layers. Here, we present thedirect synthesis of superconductor-magnet hybrid heterostructures by combiningsuperconducting niobium diselenide (NbSe$_2$) with the monolayer (ML) vanadiumdiselenide (VSe$_2$). More significantly, the in-situ growth in ultra-highvacuum (UHV) allows to produce a clean and an atomically sharp interfaces.Combining different characterization techniques and density-functional theory(DFT) calculations, we investigate the electronic and magnetic properties ofVSe$_2$ on NbSe$_2$. Low temperature scanning tunneling microscopy (STM)measurements demonstrate a reduction of the superconducting gap on VSe$_2$layer. This together with the lack of charge density wave signatures indicatesmagnetization of the sheet, but not of a conventional itinerant ferromagnet.

Electronic and Magnetic Characterization of Epitaxial VSe$_2$ Monolayers on Superconducting NbSe$_2$