Single-domain Fe₂CoGa_0.5Al_0.5 Heusler alloy nanoparticles with enhanced properties

Fine quaternary single-domain Heusler alloy nanoparticles with a composition of Fe₂CoGa_0.5Al_0.5 have been synthesized using a simple template-less chemical route for the first time. Ab initio calculations and standard models have been used to analyze and interpret the experimental findings. The synthesized nanoparticles with an average crystallite size of 42 nm exhibited high saturation magnetization (>5 μ_B f.u.^-1), high effective anisotropy constant (≈8 × 10⁶ erg cc^-1), high Curie temperature (>1200 K), low magnetic remanence (<0.2 μ_B f.u.^-1) and low coercive field (<90 Oe), declaring their suitability for fabricating various nanomagnetic devices.