Abstract In this study on Fe2-xCoxMnAl Heusler alloys, we analysed several key properties, including the electronic energy band gap, half-metallicity, magnetic moment and spin polarization (SP). These properties were studied to understand the half-metallic stability as the lattice parameter changed. The alloys consistently maintained the total magnetic moments (MTotal) predicted by the Slater-Pauling rule (SPR), with values of 2.0 μB for x = 0.0, 2.5 μB for x= 0.5, 3.0 μB for x= 1.0, 3.5 μB for x=1.5, and 4.0 μB for x= 2.0, across a wide range of lattice variations with 100% value of SP and half-metallic ferromagnetic (HMF) behavior within specific lattice ranges for x = 0.5, this behavior was observed between 5.40-5.70 Å, for x = 1.0, it was seen between 5.35-5.55 Å, for x = 1.5, the range was 5.30-5.60 Å, for x = 2.0, it occurred between 5.25-5.55 Å. Their ability to maintain a stable half-metallic character over a broad spectrum of lattice parameters also makes them strong candidates for applications in spintronics based devices. Optical characteristics of the Fe2-xCoxMnAl (x=0 to 2) alloys are investigated in terms of optical Reflectivity R(ω), optical conductivity σ(ω), Energy loss L(ω), Absorption coefficient I(ω), real and imaginary parts of the dielectric function (i.e. ε1(ω) and ε2(ω) respectively), refractive index n(ω) and extinction coefficient K(ω) provided these materials for applicable in making solar cells and optical switches.
Yadav et al. (Tue,) studied this question.