Abstract
Bulk magnetisation and polarised neutron elastic diffuse scattering measurements in the scattering vector range 0.2 AA-1<or=k<or=2 AA-1 have been performed on two ferromagnetic nickel-ruthenium alloys with 1.7 and 2.7 at.% of Ru. Analysis of the room temperature data shows that the Ru atoms carry a positive magnetic moment which increases from 0.21(20) mu B to 0.65(13) mu B for the alloy with higher impurity concentration. The nickel moment decreases linearly by about 4.4 mu B for every additional 1 at.% of ruthenium. The scattering k vector dependence of the difference of differential cross sections for neutron spin polarisation parallel and antiparallel to the sample magnetisation indicates the existence of extended moment disturbances produced by Ru impurities on their neighbours in the nickel lattice. These exhibit a kind of oscillating behaviour passing from one shell of atoms to another with a large negative value on the second nearest neighbours, and is more important for the alloy with lower impurity concentration.
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