  We present a calculation of the dephasing time of electrons in a ferromagnet
relevant for the conductance fluctuations. We focus on the contribution from
the interaction with spin waves. Explicit results are presented for a
quasi-one-dimensional systems. Going beyond previous calculations, we do not
restrict ourselves to the limit of a small exchange splitting compared to the
electronic elastic scattering time, nor does our calculation rely on the
diffusion approximation to describe electronic transport.
