Soft magnetic alloy and magnetic device

A soft magnetic alloy comprising:

• a main component of Fe;
• and
• P, wherein
• a Fe-rich phase and a Fe-poor phase are contained, and
• an average concentration of P in the Fe-poor phase is 1.5 times or larger than an average concentration of P in the soft magnetic alloy by number of atoms, and
• the soft magnetic alloy consists of a composition formula of (Fe1-αXα)(1-(a+b+c+d+e))CuaM1bPcM2dSie, in which
• X is Co,
• M1 is one or more of Ti, Zr, Hf, Nb, Ta, Mo, V, W, Cr, Al, Mn, Zn, La, Y, and S,
• M2 is one or more of B and C,
• 0≤a≤0.001 is satisfied,
• 0.040≤b≤0.150 is satisfied,
• 0.001≤c≤0.150 is satisfied,
• 0≤d≤0.200 is satisfied,
• 0≤e≤0.200 is satisfied, and
• 0≤α≤0.500 is satisfied,
• wherein a, b, c, d, e and α each represent an atomic ratio.