MAGNETIC-MOMENT CORRELATIONS IN TRANSITION-METAL ALLOYS DETERMINED BYNEUTRON-SCATTERING

Pd and Pt have been shown to be highly polarizable when mixed with fer romagnets like Ni, Fe, and Co. In these alloys the total moment, or ma gnetization cloud, is produced by the magnetic moment plus the induced moment on the surrounding atoms. With diffuse magnetic scattering of neutrons, it is possible to measure these magnetization clouds, M(K), as Fourier transform of the moments; M(K) represents the site occupati on magnetic moment correlation. We consider that the atoms of the matr ix polarize around the atoms of the impurity, following the orientatio n of its moments and forming giant moments. To compare with experiment al data, we obtained an expression for the magnetic moments assuming a local magnetic environment. We then developed an expression for the m agnetization cloud that includes the total moment associated with a gi ant moment, M(0), determined by magnetization measurements; we used M( 0) = d mu/dc, where mu is the average moment of the alloy and c the im purity concentration, to establish a relation between neutron and magn etization measurements. (C) 1997 American Institute of Physics.