Thin Films of Ferromagnetic Superconductors

Abstract

The effect of the electromagnetic interaction between the persistent current and the rare earth moments is theoretically studied in the film of ferromagnetic superconductors. Depending on the film thickness and temperature, the ferromagnetic-like order, the spin-spiral-like order and the spin-sinusoidal-like order are predicted to occur in coexistence with superconductivity. From the calculation of the free energies of these states and the normal ferromagnetic state, the phase diagram is obtained in the plane of temperature and film thickness.