Temperature Dependence of the Magnetic Excitations in Nickel

The spin-wave excitations for nickel have been measured at a series of temperatures between 4.2 and 715^∘{}K. It is found that the spin waves change very little in character even at 80^∘{} above the Curie point. A sudden decrease in the spin-wave intensity at about 80 meV, interpreted as the intersection of the spin-wave spectra with a continuum band of Stoner excitations, is also found to be quite temperature independent.