Magnetism Controlled Vortex Matter

We discuss a new class of phenomena based on strong interaction between magnetic superstructures and vortices in superconductors in combined heterogeneous structures. An inhomogeneous magnetization can pin vortices or create them spontaneously changing drastically properties of the superconductor. On the other hand, the interaction between magnetic moments mediated by vortices can result in specific types of magnetic ordering. The same interaction can create coupled magnetic-superconducting defects. We discuss possible experimental observation of magnetism controlled vortex matter in superconducting films with magnetic nanoscale dots or stripes and layered systems with alternating superconducting and magnetic layers.