Development of quaternary Fe-based bulk metallic glasses with high saturation magnetization above 1.6 T

Quaternary Fe-based ferromagnetic bulk metallic glasses (BMGs) with saturation magnetization above 1.6 T were successfully fabricated in Fe–Si–B–P alloy system by copper mold casting. These BMGs exhibit low coercive force of 1.6–1.9 A/m, high effective permeability of 16,500–17,200 and low core loss. In additional, these BMGs exhibit good mechanical properties as well, i.e., high strength of 3200 MPa and plasticity of 1.1%. They are promising to be used as magnetic functional and structural materials in the future.

► Fe-based BGAs with Ms above 1.6 T were synthesized in FeSiBP alloy system. ► These BGAs exhibit Hc of 1.7–1.9 A/m, μe of 17,400–17,700 and low core loss. ► They also exhibit good mechanical properties. ► They can be used as magnetic functional and structural materials.