Properties of vortex states induced by proximity effect in hybridFerromagnet-Superconductor systems

摘要

We investigate the properties of a thin-walled superconducting shell placed in electrical contactwith a ferromagnetic cylinder embedded in the superconductor. The case of a superconductorsurrounded by the ferromagnet is also considered. Associated with the orbital effect, spontaneousvortex states may appear, characterized by different winding numbers. Special attention is paid tothe switching between states of different vorticities and to the behaviour of the critical temperaturecaused by an external field.