NATURE OF THE MAGNETIC EXCITATIONS ABOVE TC IN NI AND FE

New high resolution polarized-beam measurements have been carried out to establish the nature of the magnetic response above T//c in nickel and iron. The data were taken on large isotopically enriched single crystals to provide adequate signal-to-noise while allowing sufficient instrumental resolution to be employed to determine the scattering profiles reliably. The magnetic scattering for all wave vectors was determined by subtracting the observed intensity with H PERPEND Q from H parallel Q. For nickel the scattering is found to evolve in a continuous fashion from the well-known spin diffusion behavior at small wave vectors q to a response with peaks centered at plus or minus E at larger q, in agreement with our early unpolarized beam work. Preliminary polarized-beam data on iron also show the development of structure in S(q, E) at larger q.