Iridium-doped iron-cobalt (Fe-Co-Ir) alloys, previously identified through machine learning, have been shown to have enhanced magnetic properties, surpassing even the widely used pure Fe-Co alloy. However, the origin of this enhanced magnetization is poorly understood. Now, scientists employed an innovative method using high-throughput X-ray magnetic circular dichroism (XMCD) measurements, demonstrating the critical role of Ir-doping. The findings will serve as a foundation for designing new high-performance magnetic materials.