THE SPONTANEOUS RESISTIVE ANISOTROPY IN PDFE ABOVE THE FERROMAGNETIC PERCOLATION-THRESHOLD

A detailed study of the anisotropy in the magnetoresistance of PdFe alloys containing between 0.35 and 2.2 at.% Fe at 1.5 and 4.2 K is presented. Using these data, the composition dependence of the spontaneous resistive anisotropy at Fe concentrations above that necessary to establish a ferromagnetic ground state is established and compared with that reported recently in PdNi. The 'exponent' governing this concentration dependence appears to be different for systems in which the impurities either carry or lack an orbital moment.