title: Full potential results on the magneto-optical properties of the Heusler compounds Co(2)FeX (X =  Al, Ga, Si and Ge).
abstract: We have calculated the magneto-optical (MO) properties of Co(2)FeX (X =  Al, Ga, Si and Ge) Heusler compounds using the full potential linearized augmented plane wave (FPLAPW) method as implemented in the WIEN2K code using the local spin density approximation (LSDA) and also by using the generalized gradient approximation (GGA) for the electronic exchange and correlation. In all the compounds, Kerr rotation θ(K) has a strong minimum near 2 eV, the value of |θ(K)| corresponding to this minimum being almost as large as in pure Co-Fe compounds. The calculated MO spectra help to identify the features of the experimental spectra. A comparison of the results shows that the Kerr spectrum is quite similar from both LSDA and GGA but the latter gives better agreement with experiment. Moreover, we find that inclusion of correlation effects using GGA+U removes the discrepancy in magnetic moment of Co(2)FeX (X =  Si, Ge) though it has an insignificant effect on the Kerr spectra.
authors.affiliation: Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India. Department of Physics, Kurukshetra University, Kurukshetra 136119, India.
authors.forename: Manish
authors.initials: M
authors.lastname: Kumar
authors.forename: Tashi
authors.initials: T
authors.lastname: Nautiyal
authors.forename: Sushil
authors.initials: S
authors.lastname: Auluck