  The simplest model for itinerant ferromagnetism, the Stoner model, has so far
eluded experimental observation in repulsive ultracold fermions due to rapid
three-body recombination at large scattering lengths. Here we show that a
ferromagnetic phase can be stabilised by imposing a moderate optical lattice.
The reduced kinetic energy drop upon formation of a polarized phase in an
optical lattice extends the ferromagnetic phase to smaller scattering lengths
where three-body recombination is small enough to permit experimental detection
of the phase. We also show, using time dependent density functional theory,
that in such a setup ferromagnetic domains emerge rapidly from a paramagnetic
initial state.
