Abstract
The inverse relationship between the saturation magnetic flux density(Bs)and coercivity(Hc)of Fe-based amorphous alloys is a very active research topic that has been extensively debated.In this work,we conducted a detailed investigation on the magnetic softness of Fe83.2-xCoxB10C6Cu0.8(x=0 and 6 at.％)amorphous alloys based on analysis of the surface morphology,microstructure,magnetic anisotropy,and magnetic domain structure.Enhanced magnetic softness-magnetization synergy was realized in the present alloys by magnetic field annealing(MFA)during the de-stressing process.A dramatic 84％re-duction of Hc to 2.2 A/m was achieved for the Co-doped alloy under MFA,exhibiting excellent magnetic performance with a superb Bs of 1.86 T.The consistency between the experimental results and theoreti-cal analysis revealed that the MFA process can mitigate the trade-off between stress-induced anisotropy and induced uniaxial anisotropy owing to the homogenized structure formed by field annealing.Thus,the process favored a low Hc due to the significant continuous decline in the total magnetic anisotropy,which coincided well with the results of Magneto-optical Kerr microscopy.The study elucidates a mech-anism for tuning Hc in Co-doped alloy systems and affords a possible pathway for softening amorphous alloys with high Bs.
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