Soft magnetic Fe-B-Si-C-Cu amorphous alloys were found to exhibit simultaneously high saturation magnetization above 1.7 T, low coercivity below 5 A/m, high permeability reaching 23100 at 1 kHz and 3500 at 1 MHz as well as high Vickers hardness above 1000 and good bending ductility. Similar good soft magnetic properties were also obtained in annealing-induced nanocluster + amorphous and nanocrystalline α-Fe + amorphous phases. The hardness increases rapidly to 1450 when a structure consisting of α-Fe + amorphous phases develops, and reaches 1820 for the α-Fe + Fe3(B,C) + Fe2B + amorphous phase mixture obtained just before the disappearance of amorphous phase.
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