Fig. 1: Schematic representation of performance enhancement in Fe-enriched amorphous ribbons through nanostructure and magnetic domain engineering.

The schematic illustrates our strategic approach in designing ultra-low core loss soft magnetic material. This highlights the correlation between the performance of Fe-enriched amorphous ribbon and changes in microstructure and magnetic domain configurations. The phenomena are depicted in three distinct scenarios: a as-spun Fe-enriched amorphous ribbons exhibit broad, curvy magnetic domains, resulting in high heat dissipation; b with the emergence of partial nanocrystallization of α-Fe in the residual amorphous matrix, a transformation to striped magnetic domain occurs, significantly reducing heat dissipation; and c a high volume fraction of nano-scale α-Fe crystals forms in a residual amorphous matrix, accompanied with compact, narrow striped magnetic domains, leading to increased heat dissipation.