INVESTIGATION OF THE GROUND STATE PROPERTIES OF SOME PERMALLOYS

Abstract

Permalloys are magnetic materials having more than one magnetic element in their composition. Compared to the conventional magnetic elements, permalloys have demonstrated exceptional properties that have favored their preference in many modern applications. Compositional variation of permalloy constituents can be significant, especially for nano material production. Some new permalloys of the stoichiometry FeCoX, NiCoX , FeNiX (X = As,Sn) are proposed and have been studied using the density functional theory. Stability of the compounds was analyzed through computing the formation energies of all the compounds and it was discovered that they were all thermodynamically feasible. Also, the electronic and magnetic properties of the alloys are systemically evaluated. The total magnetization of the magnetic alloys (NiFeAs, NiFeSn and NiCoSn) is 2.21, 2.85 and 1.33 bohr/mag respectively while the elemental magnetization of (Fe, Co and Ni) is 2.22, 1.90 and 0.73bohr/mag respectively. In comparison, it is obvious that the magnetization of the alloys is relatively higher and consequently has higher magnetic pearmeability. The result also shows that NiFeAs is a strong ferromagnet and NiFeSn and NiCoSn are weak ferromagnetic materials, while others are non-magnetic. These compounds are also predicted to be brittle and anisotropic in nature through electronic charge density distribution plots.