Air‐Stable 2D Intrinsic Ferromagnetic Ta(3)FeS(6) with Four Months Durability

2D ferromagnetic materials provide an important platform for the fundamental magnetic research at atomic‐layer thickness which has great prospects for next‐generation spintronic devices. However, the currently discovered 2D ferromagnetic materials (such as, CrI(3), Cr(2)Ge(2)Te(6), and Fe(3)GeTe(2)) suffer from poor air stability, which hinders their practical application. Herein, intrinsic long‐range ferromagnetic order in 2D Ta(3)FeS(6) is reported, which exhibits ultrahigh stability under the atmospheric environment. The intrinsic ferromagnetism of few‐layer Ta(3)FeS(6) is revealed by polar magneto‐optical Kerr effect measurement, which exhibits giant MOKE response and has Curie temperature of ≈80 K. More importantly, few‐layer Ta(3)FeS(6) nanosheet exhibits excellent air stability and its ferromagnetism remains unchanged after 4 months of aging under the atmosphere. This work enriches the family of 2D ferromagnetic materials, which will facilitate the research progress of spintronics.