  We realise bistability in the spinor of polariton condensates under
non-resonant optical excitation and in the absence of biasing external fields.
Numerical modelling of the system using the Ginzburg-Landau equation with an
internal Josephson coupling between the two spin components of the condensate
qualitatively describes the experimental observations. We demonstrate that
polariton spin bistability persists for sweep times in the range of $[10 \mu
sec,1 sec]$ offering a promising route to spin switches and spin memory
elements.
