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Herein, we demonstrate the successful synthesis of novel Fe 80 Si₉B (11&amp;minus; x ) P  x  ( x = 0, 1, 3, 5, 7) ultra-thick amorphous ribbons by planar flow casting. The influence of P alloying on glass forming ability (GFA), microstructure, thermal stability, soft magnetic properties, and ductility has been systematically investigated. The results reveal that introduction of P into Fe 80 Si₉B 11 alloy can remarkably enhance the GFA and increase critical thickness ( t  c ) of the alloy from 45 to 89 um. Furthermore, the annealed FeSiBP amorphous alloys exhibited excellent soft magnetic properties, including high saturation magnetic flux density of 1.54 T, the low coercivity of 1.5 A/m, and low core losses of 0.15 W/kg. In addition, the representative Fe 80 Si₉B₈P₃ ultra-thick amorphous alloy demonstrate excellent ductility even after annealing at 400 &amp;deg;C for 10 min, which indicates the superior performance of P-doped FeSiB alloys as compared to the commercial Fe 78 Si₉B₁₃ (Metglas 2605 S2) alloy. The combination of high GFA, excellent ductility, and low core losses of newly developed FeSiBP amorphous soft magnetic alloys makes them attractive candidates for magnetic applications in the high-frequency and high-speed electric devices.

Highly Ductile and Ultra-Thick P-Doped FeSiB Amorphous Alloys with Excellent Soft Magnetic Properties