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We experimentally and theoretically explore the creation and time evolutionof vortex lines in the polar magnetic phase of a trapped spin-1 $^{87}$RbBose-Einstein condensate. A process of phase-imprinting a nonsingular vortex,its decay into a pair of singular spinor vortices, and a rapid exchange ofmagnetic phases creates a pair of three-dimensional, singular singly-quantizedvortex lines with core regions that are filled with atoms in the ferromagneticphase. Atomic interactions guide the subsequent vortex dynamics, leading tocore structures that suggest the decay of the singly-quantized vortices intohalf-quantum vortices.

Controlled Creation and Decay of Singly-Quantized Vortices in a Polar Magnetic Phase