Study of spin and orbital magnetization in Dy- and Gd-doped Co ferrite using magnetic Compton scattering

摘要

Temperature dependent experimental magnetic Compton profiles (MCPs) of inverse spinel CoFe_(2_x)RE_xO_4 (x = 0.05; RE = Dy, Gd) have been decomposed into constituent profiles to determine site-specific spin moments. A comparison of MCPs of doped and undoped CoFe_2O_4 shows a decrease in spin moment on 5% doping of Dy and Gd. Reduction in spin moment is explained on the basis of migration of Co~(2+) ions from octahedral to tetrahedral sites, which is also supported by photoelectron spectroscopy measurements. The orbital moments deduced from combination of spin momentum density and magnetization data are found to be almost similar in doped ferrites.'