Fe-based nanocrystal soft magnetic alloy and magnetic component

A method for producing an Fe-based nanocrystalline soft magnetic alloy, the method comprising:

• an amorphous alloy preparation step of preparing an amorphous alloy by quenching and solidifying a molten metal having a composition represented by a general formula (II) by a rapid quenching method;
• and
• a heat treatment step of performing nanocrystallization by heat-treating the amorphous alloy at 500° C. to 700° C. for 5 min to 5 h, wherein
• a magnetic field is applied to the amorphous alloy during the heat treatment of the heat treatment step,
• (Fe1-p-qSipAlq)100-d-e-fQdQ′eCuf (II)
• wherein in the formula (II), Q represents one or more elements selected from the group consisting of Nb, W, Zr, Hf, Ti and Mo;
• Q′ represents one or more elements selected from the group consisting of B, C and P;
• d, e and f represent 2.0≤d≤5.0, 3.0<e<10.0 and 0<f<3.0, each in atomic %;
• p and q represent 0.150≤p≤0.250 and 0.0020≤q≤0.012 and satisfy 0.190<p+q≤0.290.