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We observe spin rotations caused by atomic collisions in a non-equilibriumBose-condensed gas of $^{87}$Rb. Reflection from a pseudomagnetic barriercreates counterflow in which forward- and backward-propagating matter waveshave partly transverse spin directions. Even though inter-atomic interactionstrengths are state-independent, the indistinguishability of parallel spinsleads to spin dynamics. A local magnetodynamic model, which captures thesalient features of the observed spin textures, highlights an essentialconnection between four-wave mixing and collisional spin rotation. The observedphenomenon has previously been thought to exist only in nondegenerate gases;our observations and model clarify the nature of these effective-magnetic spinrotations.

Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-independent Interactions