| Summary: | We report the continuous argon ions irradiation of itinerant Fe<sub>3</sub>GeTe<sub>2</sub>, a two-dimensional ferromagnetic metal, with the modification to its transport properties measured <i>in situ</i>. Our results show that defects generated by argon ions irradiation can significantly weaken the magnetization (<i>M</i>) and coercive field (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>H</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></semantics></math></inline-formula>) of Fe<sub>3</sub>GeTe<sub>2</sub>, demonstrating the tunable magnetism of this material. Specifically, at base temperature, we observed a reduction of <i>M</i> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>H</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></semantics></math></inline-formula> 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 Fe<sub>3</sub>GeTe<sub>2</sub>. These findings highlight the potential of <i>in situ</i> 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 Fe<sub>3</sub>GeTe<sub>2</sub>.
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