Magnetic and structural studies of rare earth-iron-manganese laves phase ternaries II

Abstract

Structures, magnetic properties and Mössbauer spectra of the systems Gd(Fe 1− x Mn x ) 2 , Tb(Fe 1− x -Mn x ) 2 , and Dy(Fe 1− x Mn x ) 2 are presented. The Tb and Dy alloys possess the C 15 structure for all values of x . The Gd alloys possess the C 15 structure for x ranging from 0 to 0.2 and from 0.8 to 1.0; an intermediate phase of different, and as yet unknown, structure exists in the range x =0.5 to 0.6. The Curie temperature and the Fe hyperfine field are reduced as Mn replaces Fe in the lattice. These effects are taken to be a consequence of antiferromagnetic Fe-Mn interactions.