LOW-FREQUENCY ELECTRICAL NOISE IN NI - THE EFFECTS OF MAGNETIC FLUCTUATIONS

We report measurements of the low-frequency electrical noise of Ni fil ms at temperatures from 300 K to above the Curie temperature (T-c simi lar to 625 K). The noise magnitude is found to exhibit peaks at simila r to 450 K and at T-c. This behavior and the associated noise spectra are distinctly different from those of other metals in this temperatur e range, and we argue that they are caused by magnetic fluctuations. T he form of the density of states of the responsible excitations is inf erred and found to have some interesting features.