Freshwater scarcity and the low productivity of conventional solar stills remain critical challenges in sustainable desalination, particularly in arid regions. This study proposes a novel magneto-thermal enhancement strategy for hemispherical solar stills by integrating variable-height hollow ferrite ring magnet fins combined with corrugated reflectors. The novelty lies in the simultaneous utilization of magnetic-field-assisted evaporation, extended heat transfer surfaces, and sensible thermal storage within a single passive system. Five configurations were experimentally evaluated under identical summer climatic conditions, including a conventional still and four modified systems with fin protrusion heights of 5-20 mm. The results demonstrate that increasing fin height significantly enhances thermal and thermodynamic performance. The optimal configuration (20 mm) achieved a daily freshwater yield of 7.40 L center dot m- 2 center dot day- 1 compared to 4.15 L center dot m- 2 center dot day- 1 for the conventional still, representing a 78.31% improvement. Energy efficiency increased from 28.46% to 52.25%, while exergy efficiency improved from 0.87% to 2.80%. Economically, the cost per liter decreased from 0.0511 to 0.0294 $/L, and the payback period was reduced from 34 to 19 days. The findings confirm that magnet-integrated hollow fins provide a low-cost, efficient, and scalable solution for enhancing solar distillation systems. The proposed design significantly improves both the quantity and quality of energy utilization, making it a promising approach for decentralized freshwater production in water-scarce regions.