Intrinsic ferromagnetism in epitaxial MnSe2 van der Waals monolayers at room temperature
ORAL
Abstract
Monolayer van der Waals (vdW) magnets provide an exciting opportunity for exploring two-dimensional (2D) magnetism for scientific and technological advances, but the intrinsic ferromagnetism has only been observed at low temperatures. Here, we report the observation of room temperature ferromagnetism in the monolayer limit for epitaxial MnSe2 vdW layers. Since bulk Mn-Se compounds are not ferromagnetic and bulk van der Waals crystals of MnSe2 do not exist, we rely on molecular beam epitaxy to epitaxially stabilize MnSe2 layers. Magnetization measurements of monolayer films show ferromagnetic ordering with large saturation magnetization of ~ 4 Bohr magnetons per MnSe2 formula unit, which is comparable to previous density functional theory calculations. Continued growth produces epitaxial a-MnSe/MnSe2/GaSe heterostructures that have enhanced saturation magnetization and the emergence of a new x-ray diffraction peak consistent with expectations for vdW MnSe2 provides strong evidence for multilayers of vdW MnSe2 located at the interface between non-ferromagnetic a-MnSe and GaSe. These results establish the foundation for room temperature 2D ferromagnetism in large area epitaxial vdW magnets, which has potential application in energy efficient information storage and processing.
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Presenters
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Dante O'Hara
- Univ of California - Riverside
- Physics and Astronomy, University of California Riverside