MÖSSBAUER SPECTRA OF THE AMORPHOUS ALLOYS DyM3 (M = Fe, Co, Ni)

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Abstract
Amorphous alloys DyM3, M = Fe, Co, Ni, have been studied by the 161Dy and 57Fe Mössbauer resonances, doping with iron where necessary. 57Fe-doped YNi3 was also included in the study. Results are compared with those for the corresponding crystalline alloys. Iron hyperfine fields at saturation are considerably greater (~ 30 %) in the amorphous alloys, and there is a broad distribution whose relative width is ~ 20 %. Possible reasons for a greater transition metal moment in the amorphous alloys are discussed. The Dy hyperfine field at saturation is 1 % less than in the crystalline alloys, with a distribution whose relative width is only 1 %. From the widths of lines whose positions are sensitive to the quadrupole interaction, it is deduced that the Dy moment direction is strongly correlated with the (random) direction of the lattice contribution to the electric field gradient. Magnetic structures are proposed in which the Dy moments are essentially distributed over all directions within an hemisphere while the Fe or Co is ferromagnetic. The Ni moment is very small

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