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A soft magnetic alloy including a composition having a formula of ((Fe (1-(±+²)) X1 ± X2 ² ) (1-(a+b+d+e)) M a , B b Cr d Cu e ) 1 - f C f . X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030 ‰¦ a ‰¦ 0.14, 0.028 ‰¦ b ‰¦ 0.15, 0.005 ‰¦ d ‰¦ 0.020, 0
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