This study explores the modelling of the isothermal magnetization, and the magnetic entropy change curves of GdGa1−xAlx alloys with x = 0, 0.3 and 0.5 via the mean-field model. Magnetization data were analyzed to fit the exchange mean-field, and scaling methods were applied to determine the saturation magnetization \(\:{M}_{0}\) , the total spin \(\:J\) and the Lande factor \(\:g\) . As the Al content increases from x = 0 to 0.5, the saturation magnetization \(\:{M}_{0}\) rises from 142.40 to 184.50 emu·g⁻¹, \(\:J\) slightly decreases from 3.70 to 3.31, while \(\:g\) remains practically constant at ~ 2. Results demonstrate a notable magnetocaloric effect (MCE), with peak entropy changes reaching 5.57, 5.86, and 7.76 J·kg⁻¹·K⁻¹ for x values of 0, 0.3, and 0.5, respectively, under a magnetic field variation of 0–5 T. The temperature-averaged entropy change (TEC) remains consistently stable over a broad thermal span, suggesting good potential for cooling technologies. Among the compositions, the x = 0.5 alloy exhibits the highest TEC of 7.48 J·kg⁻¹·K⁻¹ under 5 T magnetic field, highlighting improved MCE performance with increased Al incorporation.
