Ferromagnetism and Rashba Spin–Orbit Coupling in the Two-Dimensional (V,Pt)Se2 Alloy

We report on a two-dimensional (2D) V 1– x Pt x Se 2 alloy that exhibits ferromagnetic order and Rashba spin–orbit coupling. Although ferromagnetism is absent in 1T-VSe 2 because of the competition with the charge density wave phase, we demonstrate theoretically and experimentally that the substitution of vanadium by platinum in VSe 2 (10–50%) to form a homogeneous 2D alloy restores ferromagnetic order down to one monolayer of V 0.65 Pt 0.35 Se 2 . Moreover, the presence of platinum atoms gives rise to Rashba spin–orbit coupling in (V,Pt)Se 2, providing an original platform to study the interplay between ferromagnetism and spin–orbit coupling in the 2D limit.