Abstract

The spatial distribution of ferromagnetic moment associated with Fe and Co atoms dissolved dilutely in Pd has been examined with long-wavelength neutrons at liquid helium temperature. The moments in 3d orbitals at the impurity sites are (3.5 ± 0.4) μB and (2 1 ± 0.3) μB for Fe and Co respectively. The distribution of polarization in the surrounding Pd matrix appears to be rather similar for these two solutes and extends out to a distance of almost 10 A. This is somewhat smaller than, but of the same order of magn tude as, the ferromagnetic interaction range deduced from the lower limiting concentrations for the occurrence of ferromagnetism. The moment induced on individual Pd atoms is quite small, that on the nearest neighbours to a solute atom being approximately 1/20 μB; the giant moments associated with Fe and Co additions arise through some 200 Pd atoms being influenced by each impurity.

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