“…Using the values of A and D , D cr for Fe 2 CoAl alloy was evaluated to be 83 nm, which is higher than the crystallite size of the synthesized nanoparticles (see Table ), which authenticates that the produced nanoparticles are in a single-domain regime. The literature does not provide any approximated value of D cr , A , and D for Fe 2 CoAl nanoparticles to make a comparison, but the reported A and D values range for other Fe and Co-based Heusler nanoparticles as for Co 2 FeAl ( A = 12.0–17.5 × 10 –7 erg/cm; D = 7.850 × 10 –29 erg/cm 2 ), Fe 2 CoGa ( A = 5.39 × 10 –7 erg/cm; D = 2.89 × 10 –29 erg/cm 2 ), Co 2 FeGa ( D = 8.394 × 10 –29 erg/cm 2 ), Co 2 FeSi ( D = 3.653 × 10 –29 erg/cm 2 ), Co 2 MnAl ( A = 4.8 × 10 –7 erg/cm; D = 4.614 × 10 –29 erg/cm 2 ), Co 2 MnGa ( D = 4.229 × 10 –29 erg/cm 2 ), Co 2 MnGe ( A = 10.7–13.8 × 10 –7 erg/cm; A = 9.8 × 10 –7 erg/cm), Co 2 MnSi ( A = 23.5 × 10 –7 erg/cm; A = 4.6–5.0 × 10 –7 erg/cm; D = 5.367 × 10 –29 erg/cm 2 ), Co 2 CrGa ( D = 3.236 × 10 –29 erg/cm 2 ) validates our results.…”