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The local magnetic moments and hyperfine magnetic fields (HFF) in the orderedalloys Fe_{15}Sn and Fe_{15}Si are calculated with the first-principlesfull-potential linear augmented plane wave (FP LAPW) method. The results arecompared with the experimental data on Fe-M (M=Si, Sn) disordered alloys atsmall metalloid concentration. The relaxation of the lattice around theimpurity and its influence on the quantities under consideration are studied.The mechanism of the local magnetic moment formation is described. It is provedthat the main distinction between these alloys is connected with the differentlattice parameters. Three contributions to the HFF are discussed: thecontributions of the core and valence electron polarization to theFermi-contact part, and the contibution from the orbital magnetic moment.Comment: 3 pages, 3 figures, submitted to Phys. Rev.

Local magnetic moments and hyperfine magnetic fields in disordered metal-metalloid alloys