High Bs of FePBCCu nanocrystalline alloys with excellent soft-magnetic properties

Abstract High saturation magnetic flux density (Bs) nanocrystalline alloys are increasingly attractive due to their unique microstructure and outstanding magnetic performance. In this work, we report that the substitution of B for P essentially improves the Bs of FePBCCu amorphous alloys. Based on high Bs amorphous matrix, the Fe83.2P8B2C6Cu0.8 nanocrystalline alloy with high Bs of 1.77 T, low coercivity of 3.6 A/m and high effective permeability of 20,600 was developed. Such magnetic performance of Fe83.2P8B2C6Cu0.8 nanocrystalline alloy is closely associated with the uniform refined composite microstructure, where the α-Fe nanocrystals with high volume fraction, small size and high number density (~1.8 × 1023 m − 3) were formed. This finding makes the FePBCCu composite a kind of promising soft-magnetic material in electrical and electronic fields.