AI-discovered magnetic material: Fe5Mn2B4 (performance score: 0.592) | Space group: 1 (resolved from structure) | AI-generated from scratch using crystal structure prediction | Key properties: Tc: 497K, Ms: 0.12T, Cost: $1/kg, E_hull: 0.383eV/atom, Dynamically unstable | Discovered in 3 AI iterations | The key insight is that although Fe5Mn2B4 shows promising magnetic density and a Curie temperature close to the target, its high energy above hull and dynamic instability make it unsuitable in its current form. Stability is a critical limiting factor that must be addressed to realize this material’s potential. Additionally, the low cost suggests that if stability can be improved, the material could be economically attractive.