Fe-BASED ALLOY COMPOSITION, SOFT MAGNETIC MATERIAL, MAGNETIC MEMBERS, ELECTRIC/ELECTRONIC COMPONENT, AND DEVICE

An Fe-based alloy composition capable of forming a soft magnetic material which contains an amorphous phase having a glass transition temperature Tg, the Fe-based alloy composition having a composition represented by the formula (Fe1−aTa)100at%−(x+b+c+d)MxBbCcSid, where T is an optional additive which is at least one element selected from the group consisting of Co and Ni, and M is an optional additive which is at least one element selected from the group consisting of Ti, V, Cr, Zr, Nb, Hf, Ta, W, and Al,

• wherein the formula satisfies:
• a first set of conditions including 0≤a≤0.3, 11.0 at %≤b≤18.20 at %, 6.00 at %≤c≤17 at %, 0 at %≤d≤10 at %, and 0 at %≤x≤4 at %;
• or
• a second set of conditions including 0≤a≤0.3, 11.0 at %≤b≤20.0 at %, 1.5 at %≤c<6 at %, 0 at %<d≤10 at %, 0 at %≤x≤4 at %, and 0.25≤R≤0.32, where R=(b+c)/[(1−a)×{100 at %−(x+b+c+d)}].