Wave number and temperature dependent Landau-Lifshitz damping in nickel

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Abstract
Using the technique of microwave transmission at FMAR, we have measured the temperature dependence of the Landau‐Lifshitz damping parameter λ in nickel. It was found that the magnitude of λ increased by a factor 4 over the temperature range 300 K–77 K. The microscopic theory of spin wave damping indicates that there are two contributions to the damping parameter; the one proportional to the resistivity and the other to the wave number dependent conductivity. We compare our experimental results with this theory and with the previous work of Bhagat using FMR.