We investigate the state of amorphous pure Fe by utilizing various Fe‐based amorphous alloy systems having stable amorphous phases up to very high Fe concentrations and extrapolating the properties toward those of amorphous pure Fe. Concentration dependence of hyperfine interaction parameters of Fe‐early transition metal (Ti, Zr, Hf, Nb, Ta, and Mo) and Fe‐metalloid (B, Sb, Si, and Ge) reveals the polymorphism of amorphous Fe.

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