Abstract
Abstract We show how fairly well-defined sloppy spin waves can arise in itinerant ferromagnets above the Curie point, by making a generalized Hartree-Fock treatment of paramagnon-paramagnon interactions of all orders. By treating these interactions as approximately local, one may express the susceptibility χ( q , ω) in the form χ 0 ( q , ω)[1 − 2 3 U χ 0 ( q , ω)] -1 , where χ 0 is an average of the susceptibility of the noninteracting system over a maxwellian distribution of fluctuating magnetic fields. The consequent fluctuating Stoner gap can lead to fairly well-defined propagating excitations in a limited range of wavenumbers.
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