  Ferromagnetism is an exciting phase of matter exhibiting strongly correlated
electron behavior and a standard example of spontaneously broken rotational
symmetry: below the Curie temperature, atomic magnets in an isotropic
single-domain ferromagnetic metal align along a spontaneously chosen direction.
The scattering of conduction electrons from thermal perturbations to this spin
order, together with electron-electron collisions, mark the material electrical
behavior at low temperatures, where the resistivity varies mostly quadratically
with the temperature. Around liquid-helium temperatures however, an interesting
phenomenon occurs, giving rise to an extra \emph{linear} contribution to the
variation of the electrical resistivity with temperature, whose theoretical
explanation has encountered problems for a long time. Here I introduce a
spin-flip scattering mechanism of conduction electrons in ferromagnetic metals
arising from their interaction with the internal magnetic induction and
mediated by chiral modes of the crystal lattice vibrations carrying spin 1.
This mechanism is able to explain the above anomaly and give a good account of
the spin-lattice relaxation times of iron, cobalt and nickel at room
temperatures.
