Abstract
The ability to imprint a given material property to another through a proximity effect in layered 2D materials has opened the way to the creation of designer materials. Here, molecular-beam epitaxy is used for direct synthesis of a superconductor-ferromagnet heterostructure by combining superconducting niobium diselenide (NbSe2 ) with the monolayer ferromagnetic chromium tribromide (CrBr3 ). Using different characterization techniques and density-functional theory calculations, it is confirmed that the CrBr3 monolayer retains its ferromagnetic ordering with a magnetocrystalline anisotropy favoring an out-of-plane spin orientation. Low-temperature scanning tunneling microscopy measurements show a slight reduction of the superconducting gap of NbSe2 and the formation of a vortex lattice on the CrBr3 layer in experiments under an external magnetic field. The results contribute to the broader framework of exploiting proximity effects to realize novel phenomena in 2Dheterostructures.
Highlights
Two-dimensional magnetic materials constitute an ideal platform to experimentally access the fundamental physics of magnetism in reduced dimensions[1,2,3]
1Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland 2Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan The ability to imprint a given material property to another through proximity effect in layered two-dimensional materials has opened the way to the creation of designer materials
While the first reports relied on mechanical exfoliation for the sample preparation, related materials CrBr3 and Fe3GeTe2 have been grown using molecular-beam epitaxy (MBE) in ultra-high vacuum (UHV)[22,23], which is essential for realizing clean edges and interfaces
Summary
Two-dimensional magnetic materials constitute an ideal platform to experimentally access the fundamental physics of magnetism in reduced dimensions[1,2,3]. We use molecular-beam epitaxy (MBE) for a direct synthesis of a superconductor-magnet hybrid heterostructure by combining superconducting niobium diselenide (NbSe2) with the monolayer ferromagnetic chromium tribromide (CrBr3).
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