In Situ Tuning of Magnetism in Fe₃GeTe₂ via Argon Ions Irradiation

We report the continuous argon ions irradiation of itinerant Fe3GeTe2, a two-dimensional ferromagnetic metal, with the modification to its transport properties measured in situ. Our results show that defects generated by argon ions irradiation can significantly weaken the magnetization (M) and coercive field (Hc) of Fe3GeTe2, demonstrating the tunable magnetism of this material. Specifically, at base temperature, we observed a reduction of M and Hc by up to 40% and 62.4%, respectively. After separating the contribution from different mechanisms based on the Tian-Ye-Jin (TYJ) scaling relation, it's the skew scattering that dominates the contribution to anomalous Hall effect in argon ions irradiated Fe3GeTe2. These findings highlight the potential of in situ transport modification as an effective method for tailoring the magnetic properties of two-dimensional magnetic materials, and provides new insights into the mechanisms underlying the tunable magnetism in Fe3GeTe2.