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Recent experiments [Jo et al., Science 325, 1521 (2009)] have presentedevidence of ferromagnetic correlations in a two-component ultracold Fermi gaswith strong repulsive interactions. Motivated by these experiments we considerspin drag, i.e., frictional drag due to scattering of particles with oppositespin, in such systems. We show that when the ferromagnetic state is approachedfrom the normal side, the spin drag relaxation rate is strongly enhanced nearthe critical point. We also determine the temperature dependence of the spindiffusion constant. In a trapped gas the spin drag relaxation rate determinesthe damping of the spin dipole mode, which therefore provides a precursorsignal of the ferromagnetic phase transition that may be used to experimentallydetermine the proximity to the ferromagnetic phase.

Spin drag in an ultracold Fermi gas on the verge of a ferromagnetic instability