Little-Parks oscillations in hybrid ferromagnet–superconductor systems

A. V. Samokhvalov; A. S. Mel’nikov; J-P. Ader; A. I. Buzdin

doi:10.1103/PhysRevB.79.174502

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Little-Parks oscillations in hybrid ferromagnet–superconductor systems

A. V. Samokhvalov, A. S. Mel’nikov, J-P. Ader, A. I. Buzdin

DOI 10.1103/PhysRevB.79.174502 · Physical Review B

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Abstract

On the basis of linearized Usadel equations we consider superconductivity nucleation in multiply connected mesoscopic superconductor/ferromagnet hybrids such as thin-walled superconducting cylinders placed in electrical contact with a ferromagnetic metal. We study the interplay between the oscillations of Tc due to the Little-Parks effect and the oscillations due to the exchange field. We demonstrate that the exchange field provokes switching between the superconducting states with different vorticities and this may result in the increase in the critical temperature of the superconducting transition in the magnetic field. Moreover we analyze the influence of the S/F transparency on the realization of the states with higher vorticities.