Current driven organization of magnetic vortices

We report on a novel form of oganization of magnetic vortices in a superconductor driven by a current. By following the vortex motion with fast transport measurements we show that the current enables the system to escape out of metastable states and explore its energy landscape. Ar low fields and temperatures the system relaxes into an ordered vortex lattice while just below H-e it is in a disordered state. In the intermediate region the vortex state can be controlled by an external driving current. In this regime the critical current can be either increased or decreased with an appropriate driving current.