FE-BASED NANO-CRYSTALLINE ALLOY

An alloy composition which includes 82 atomic % to 86 atomic % Fe, 6 atomic % to 12 atomic % B, 3 atomic % to 8 atomic % P, 0.6 atomic % to 1.0 atomic % Cu, 0 atomic % to 5 atomic % C, 0 atomic % to 3 atomic % E, 0 wt. % to 0.5 wt. % Al, 0 wt. % to 0.3 wt. % Ti, 0 wt. % to 0.94 wt. % Mn, 0 wt. % to 0.082 wt. % S, 0 wt. % to 0.3 wt. % O and 0 wt. % to 0.01 wt. % N. In the alloy composition, E is at least one element selected from the group consisting of Zr, Hf, Nb, Ta, Mo, W, Cr, Ag, Zn, Sn, As, Sb, Bi, Y and a rare-earth element, wherein Cr is contained in an amount of 0 atomic % to 1 atomic %, and the total amount of Fe and E is 82 atomic % to 86 atomic %. The alloy composition has a structure which includes an amorphous phase.