Ferromagnetic Resonance in Nickel at High Temperatures

Abstract

Ferromagnetic resonance measurements on high-purity nickel metal are reported at 23 and 32 kMc/sec and at temperatures varying between 20 and 380°C. Up to 300°C a temperature-independent relaxation parameter ($\lambda =2.3\mathrm{}\times {10}^8$ ${\sec }^{-1\mathrm{}}$) and $g=2.21\mathrm{}$ describe the data adequately. At higher temperatures, the lines become much narrower than expected from such a value of $\lambda$, and the $g$ value becomes somewhat dependent on temperature as well as frequency.