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The advancement in the process of heating/cooling leads to a saving in energy, time, and life expectancy of the equipment. The effective heat transport can likewise be improved by increasing the thermal conductivity of the regular liquid. The current study explores the Brownian movement and thermophoresis on unsteady, radiative Casson magneto-nonoliquid stagnation point flow over a stretching sheet saturated in a porous medium in the presence of exponential space-based heat source/sink (ESHS). The resultant non-linear ordinary differential equations (ODEs) are solved by Runge-Kutta fourth order method with shooting technique. The significant results of the study presented through figures and tables. It is found that the more of Casson fluidity enhances the momentum diffusion in the flow domain and reduces the thermal and mass diffusion processes. The temperature distribution exceeds the prescribed temperature at the plate surface for higher diffusion. Hence, care should be taken to regulate the thermal diffusion to avoid the thermal instability.