A contribution to the theory of spin waves in a metallic spin glass

Publisher Website
Google Scholar
Abstract
A theory of spin waves in a metallic spin glass is studied using a simple analytical model which describes an important aspect of an equilibrium state of the system. For a sufficiently small wavenumber k the real frequency of the spin wave is proportional to k if correlations between the spins and their interactions are taken into account. Effect of the inhomogeneity in the spin systems is examined perturbationally. It gives rise to the damping rate of the spin wave proportional to k4, which is shown to be quite small. The author also discusses a possible energy gap in the excitation spectrum due to the magnetic dipole interactions.