Abstract
The purpose of present investigation was to study the e ects of phase decomposition of the Cu0.4Mn0.3Ni0.3 alloy on its magnetic ordering. The single-crystal sample was examined by elastic neutron scattering before and after ve subsequent annealing runs. The results indicate that in small fraction of the quenched sample volume there are two types of antiferromagnetic order: one of them AF1 of the long range, the other one of the short range. Ageing induces phase decomposition which yields disappearance of AF1 long range order and increase of the volume of new ordered phase. The results of the investigations of the aged sample indicate that regions of new tetragonal phase exhibit antiferromagnetic ordering with magnetic moments of Mn atoms arranged as in the pure compound MnNi but with unequal domain distribution. The intensity of magnetic component of super-structure re ections increases with the duration of ageing at lower rate than component due to atomic order.
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