Electronic structure and magnetic properties of disordered Co2FeAl Heusler alloy

The effects of disorder on the magnetic properties of Co₂FeAl alloy are reported. X-ray diffraction exhibit A2-type disordered structure. Room temperature Mössbauer studies show the presence of two sextets with hyperfine field values of 31T and 30T along with a nonmagnetic singlet. The electronic structure of ordered and disordered Co₂FeAl alloys, investigated by means of the KKR Green's-function method shows that the magnetic moment of the ordered structure is 5.08μ_B and is 5.10μ_B when disordered. However, a much higher magnetic moment of 5.74μ_B is observed experimentally.