Abstract
A wide-ranging neutron scattering study has been performed of the atomic and magnetic structure of amorphous Dy 7Ni 3 by use of the double-null isotopic substitution technique. This technique is shown to be very powerful. In Dy 7Ni 3 the nickel atoms, considered as hard spheres, are close to each other but not touching. The atomic structure is thus more ordered than for a random close packing of hard spheres. The nickel magnetic moments are quenched and there is a tendency for parallel alignment between neighbouring dysprosium moments. The indications are that magnetic anisotropy is low.
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