A research team led by the Ningbo Institute of Materials Technology and Engineering (NIMTE), CAS, has achieved a breakthrough in spintronics by demonstrating that nonsymmorphic symmetry in hexagonal SrIrO₃ protects topological Dirac semimetal states. This unique electronic structure leads to record-breaking charge-spin conversion efficiency, enabling magnetic switching with ultra-low power dissipation. The study establishes a robust and universal criterion for designing future energy-efficient spintronic devices.