Effect of Ion Irradiation on the Anomalous Hall Effect in Cr _1+δ Te ₂

ABSTRACT The emergence of intrinsic 2D magnetic materials has opened new avenues for spintronic applications. Among them, Cr 1+δ Te 2 has attracted significant interest due to its near‐room‐temperature ferromagnetism and widely‐tunable chemical stoichiometry. In this work, we demonstrate a comprehensive study on the controlled modification of magnetic and electronic transport properties in 2D Cr 1+δ Te 2 through focused Ga⁺ ion irradiation. Specifically, we achieved a progressive reduction and eventual full suppression of the anomalous Hall effect (AHE) sign‐reversal temperature via modulating the irradiation dose, while the Curie temperature remains notably stable. Cross‐sectional and elemental mapping analyses revealed irradiation‐induced structural and compositional changes, highlighting the potentially distinct role of structural amorphization and stoichiometric variation in mediating the AHE behavior and magnetic ordering. The discovery of residual magnetism and tunable AHE in the amorphized structures establishes focused ion beam irradiation as a viable method for designing crystalline/amorphous architectures, offering great promise for the design of novel functionalities.