Behavior of magnetization in high magnetic fields of (Sm,Ho)2Fe17N2.4 powders obtained by mechanical grinding

Abstract

Abstract Fundamental magnetic properties of the R2Fe17 compounds are highly sensitive to the atomic substitutions and interstitial absorption of light elements (nitrogen or hydrogen). In our work, both were combined, and the influence of the substitutions in the R-sublattice and nitrogen absorption on the magnetization behavior of Sm2Fe17 compound in magnetic fields up to 58 T was studied. (Sm,Ho)2Fe17N2.4 nitride was prepared. Magnetisation measurements were carried out on powder samples. Nanopowders of (Sm,Ho)2Fe17N2.4 were obtained by mechanical grinding. The grinding time was varied from 0 to 60 minutes. The strength of the inter-sublattice coupling in all samples is estimated by analyzing high-field magnetization data. In our work is shown that nitrogenation weakens the inter-sublattice exchange interaction in the compounds up to 45 - 50 %. Grinding time and, as a consequence, particle size affects the inter-sublattice exchange interaction. To achieve a ferromagnetic state, fields are needed well in excess of 58 T.