Abstract
Temperature dependent spin momentum densities of polycrystalline CoCr2-xFexO4 (x = 0.4 and 1) with inverse spinel structure have been measured using magnetic Compton spectrometer. Estimated site specific and absolute spin moments are compared with the magnetization measurements to deduce the orbital magnetic moments. To supplement the present magnetic Compton scattering data, spin-polarized relativistic band structure calculations employing Korringa-Kohn-Rostoker Green’s-function formalism have also been performed. Ferri-magnetic nature of CoCr2-xFexO4 (x = 0.4 and 1) systems have been explained on the basis of distribution of Fe and Co atoms between tetrahedral and octahedral sites. The suggested mixed spinel structure arrangement is supported by experimentally observed spin magnetic moments and minimum ground state energies which shows the potential of magnetic Compton spectroscopy in resolving the structural-cum-magnetic issues of such oxides.
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