Abstract
DyNiAl orders ferromagnetically below T C=30 K with the Dy magnetic moments oriented along the hexagonal c-axis, and undergoes an order–order magnetic phase transition at T 1=15 K where an antiferromagnetic component appears in the basal plane leading to a non-collinear magnetic structure. Magnetization measurements on a DyNiAl single crystal in fields up to 40 T revealed a large uniaxial magnetic anisotropy with anisotropy field of 25 T and field-induced transitions in fields applied along the basal plane. A low-field transition is observed in both magnetic phases and is associated with a rotation of the total magnetic moment toward the field direction to form a canted magnetic structure, which is stable in a wide field interval. A high-field transition is observed only in the low-temperature phase and corresponds to a spin flop of the antiferromagnetic component.
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