X-MCD STUDY OF EXPANDED LATTICE PERMANENT-MAGNET MATERIALS

X-ray magnetic circular dichroism measurements on the cobalt (iron) K edges and samarium L-2, L-3 edges of Sm2Fe17, Sm2Co17 and their inters titial hydrides and nitrides are reported. Normal absorption profiles show considerable changes upon nitriding for iron- and cobalt ii edge and for samarium L-2, L-3 edges. Much weaker changes are observed upon hydriding. Similarly, significant differences of X-MCD spectra appear between the host Sm2Fe17 (Sm2Co17) and the nitrides, whereas X-MCD si gnals of the hydrides are similar to those of the hosts. The effects a re analysed and discussed in terms of influence of interstitial atom n eighbours on the Co(Fe) 4p and Sm 5d electronic bands.