Relationship among intrinsic magnetic parameters and structure and crucial effect of metastable Fe3B phase in Fe-metalloid amorphous alloys

The intrinsic heterogeneity of an amorphous structure originates from composition,and the structure de-termines the magnetic properties and crystallization models of amorphous magnets.Based on classical Fe-B binary magnetic amorphous alloys,the relationship between the structure and magnetic properties was extensively studied.The stacking structure of Fe-B binary amorphous alloys exhibit discontinuous changes within the range of 74-87 at.%Fe.The structural feature can be expressed as Amor.Fe_(3)B ma-trix+Fe atoms are transforming into Amor.Fe matrix+B atoms with the increase of Fe content.The so-lute atoms are uniformly distributed in the amorphous matrix holes,similar to a single-phase solid solu-tion structure.The transition point corresponds to the eutectic crystallization model composition(Fe_(82)B_(18) to Fe_(83)B_(17)).A high Fe content will amplify magnetic moment sensitivity to temperature.Under a given service temperature,the disturbance effect of magnetic moment self-spinning will offset the beneficial effect of increasing Fe content and induce the saturation magnetization(Ms)value to decrease.Binary amorphous Fe-B alloys obtain the maximum Curie temperature near 75 at.%Fe,which is slightly smaller than that of the corresponding metastable Fe_(3)B phase,i.e.,the amorphous short-range order structure maintains the highest similarity to the Fe_(3)B phase.The chemical short-range ordering(SRO)structure of amorphous alloys exhibits heredity to corresponding(meta)stable crystal phases.The unique spatial orientation structure of the metastable Fe_(3)B phase is the structural origin of the amorphous nature.This study can guide the composition design of Fe-metalloid magnetic amorphous alloys.The design of ma-terials with excellent magnetic properties originates from a deep understanding of precise composition control and temperature disturbance mechanism.