High Curie Temperature in 2D Fe 0.98 In 0.02 Te Ferromagnetic Semiconductor via Indium‐Induced Superexchange Enhancement

ABSTRACT 2D ferromagnetic semiconductors are promising for spintronic and quantum applications by integrating electronic and magnetic functionalities at the atomic scale. However, most known ferromagnetic semiconductors suffer from Curie temperatures ( T C ) well below room temperature. Here, we report a 2D ferromagnetic semiconductor Fe 0.98 In 0.02 Te (FIT), exhibiting n‐type conduction and a record‐high T C of 860 K among known 2D magnetic materials to date. The intrinsic ferromagnetism and magnetic domain evolution were confirmed by X‐ray magnetic circular dichroism and magnetic force microscopy measurements. Density functional theory calculations indicate that In enhances ferromagnetic coupling and magnetic anisotropy energy in FIT through local electronic and structural modulation. Our findings pave the way for the applications of 2D ferromagnetic materials in spintronic device fabrication.