  We study the onset of spin superfluidity, namely coherent spin transport
mediated by a topological spin texture, in frustrated exchange-dominated
magnetic systems, engendered by an external magnetic field. We show that for
typical device geometries used in nonlocal magnetotransport experiments, the
magnetic field stabilizes a spin superflow against fluctuations, up to a
critical current. For a given current, the critical field depends on the
precessional frequency of the texture, which can be separately controlled. We
contrast such dynamic stabilization of a spin superfluid to the conventional
approaches based on topological stabilization.
