Soft magnetic alloy powder, dust core, and magnetic component

A soft magnetic alloy powder comprising a plurality of soft magnetic alloy particles of a soft magnetic alloy represented by a composition formula (Fe(1−(α+β))X1αX2β)(1−(a+b+c+d+e))MaBbPcSidCe, wherein

• X1 represents at least one selected from the group consisting of Co and Ni;
• X2 represents at least one selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O and rare earth elements;
• M represents at least one selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W and V;
• a, b, c, d, e, α and β satisfy the following relations:
• 0.020≤a≤0.14,
• 0.020<b≤0.20,
• 0<c≤0.15,
• 0≤d≤0.060,
• 0≤e≤0.040,
• α≥0,
• β≥0, and
• 0≤α+β≤0.50;
• and wherein
• the soft magnetic alloy has a nano-heterostructure with initial fine crystals present in an amorphous substance;
• the surface of each of the soft magnetic alloy particles is covered with a coating portion;
• the coating portion comprises at least one selected from the group consisting of P2O5—ZnO—R2O—Al2O3 glass where R represents an alkali metal, Bi2O3—ZnO—B2O3—SiO2 glass and BaO—ZnO—B2O3—SiO2—Al2O3 glass;
• a thickness of the coating portion is 5 nm or more and 200 nm or less;
• and
• a resistivity of the soft magnetic alloy powder when a pressure of 0.6 t/cm2 is applied to the soft magnetic alloy powder is 104 Ωcm or more.