Soft magnetic alloy and magnetic device

1. 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 (Fe 1-α X α ) (1-(a+b+c+d+e)) Cu a M1 b P c M2 d Si e , 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.

2. The soft magnetic alloy according to claim 1 , wherein the average concentration of P in the Fe-poor phase is 1.0 at % or more and 50 at % or less.

3. The soft magnetic alloy according to claim 1 , wherein the average concentration of P in the Fe-poor phase is 3.0 times or larger than an average concentration of P in the Fe-rich phase.

4. The soft magnetic alloy according to claim 2 , wherein the average concentration of P in the Fe-poor phase is 3.0 times or larger than an average concentration of P in the Fe-rich phase.

5. The soft magnetic alloy according to claim 1 , comprising Fe based nanocrystallines.

6. The soft magnetic alloy according to claim 5 , wherein the Fe based nanocrystallines have an average grain size of 5 nm or more and 30 nm or less.

7. The soft magnetic alloy according to claim 1 , comprising a ribbon shape.

8. The soft magnetic alloy according to claim 1 , comprising a powder shape.

9. A magnetic device comprising the soft magnetic alloy according to claim 1 .