Current driven organization of magnetic vortices

We report on a novel form of oganization of magnetic vortices in a supercon ductor driven by a current. By following the vortex motion with fast transp ort measurements we show that the current enables the system to escape out of metastable states and explore its energy landscape. Ar low fields and te mperatures the system relaxes into an ordered vortex lattice while just bel ow H-e it is in a disordered state. In the intermediate region the vortex s tate can be controlled by an external driving current. In this regime the c ritical current can be either increased or decreased with an appropriate dr iving current.