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We have experimentally observed the emergence of spontaneousantiferromagnetic spatial order in a sodium spinor Bose-Einstein condensatethat was quenched through a magnetic phase transition. For negative values ofthe quadratic Zeeman shift, a gas initially prepared in the F = 1, mF = 0 statecollapsed into a dynamically evolving superposition of all 3 spin projections,mF = 0, +/-1. The quench gave rise to rich, nonequilibrium behavior where bothnematic and magnetic spin waves were generated. We characterized thespatiotemporal evolution through two particle correlations between atoms ineach pair of spin states. These revealed dramatic differences between thedynamics of the spin correlations and those of the spin populations.

Antiferromagnetic Spatial Ordering in a Quenched One-dimensional Spinor Gas