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.
