Crystal field in hydrogenated and nitrogenated SmFe/sub 11/Ti compound

Summary form only given. The insertion of the light interstitial elements (hydrogen and nitrogen) into the RFe/sub 11/Ti (R is rare-earth metal) crystalline lattice results in an apparent change of the rare-earth intermetallic compounds magnetic properties. The hydrides and nitrides of these compounds retain the ThMn/sub 12/ type structure of the parent alloys, however interstitial modification leads to a volume expansion, which is main cause for the improvement of Curie temperature (T/sub C/) and saturation magnetization. The change from easy plane to easy axis magnetic anisotropy for the RFe/sub 11/TiN/sub x/ (R=Tb, Dy) is ascribed to modification of the rare-earth crystal field due to the surrounding nitrogen atoms. Another example of interstitial modification is a nitriding of the easy axis SmFe/sub 11/Ti, whose nitride SmFe/sub 11/TiN shows easy-plane anisotropy. The crystal field in Sm/sub 2/Fe/sub 17/N/sub 3/ and SmFe/sub 11/TiN has been investigated by Skomski et al. (1993). The aim of our work is to study the effect of interstitial hydrogen on the rare-earth crystal field in SmFe/sub 11/TiH single crystal, based on single ion anisotropy model and to compare it with the effect of interstitial nitrogen atoms on the SmFe/sub 11/TiN.