Vortex states induced by proximity effect in hybrid ferromagnet-superconductor systems

A. V. Samokhvalov; A. S. Mel’nikov; A. I. Buzdin

doi:10.1103/PhysRevB.76.184519

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Vortex states induced by proximity effect in hybrid ferromagnet-superconductor systems

A. V. Samokhvalov, A. S. Mel’nikov, A. I. Buzdin

DOI 10.1103/PhysRevB.76.184519 · Physical Review B

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Abstract

We consider superconductivity nucleation in multiply connected mesoscopic samples such as thin-walled cylinders or rings placed in electrical contact with a ferromagnet. The superconducting critical temperature and order parameter structure are studied on the basis of linearized Usadel equations. We suggest a mechanism of switching between the superconducting states with different vorticities caused by the exchange field and associated with the oscillatory behavior of the Cooper pair wave function in a ferromagnet.