Ferromagnetism induced by in-plane strain in a bulk VS 2 -based superlattice: (LiOH) 0.1 VS 2 .

Transition metal dichalcogenides (TMDs) have attracted intensive research interest due to their diverse properties. However, ferromagnetism is not observed in layered TMDs, except for monolayer VSe 2 . In this study, we report the synthesis of a bulk ferromagnetic material (LiOH) 0.1 VS 2 based on topochemical reactions. The results demonstrate that the (LiOH) 0.1 VS 2 crystal exhibits strong anisotropic ferromagnetism below a critical temperature of 40 K. Calculations uncover that the in-plane strains in a VS 2 superlattice can induce large magnetic anisotropic energy, which stabilizes the long-range ferromagnetic order. The findings provide a new approach to induce ferromagnetism in bulk TMD materials.