An extensive study of the electromagnetic interaction in magnetic/superconducting bilayers is presented. The direct visualization of the magnetic pattern in manganite/cuprate superconductor bilayers is achieved by means of the magneto-optical imaging technique [1]. Quantitative evaluation of the supercurrent distribution in patterned YBCO layers grown on LSMO films with different doping levels is performed, in order to study the local coupling between the magnetic and the superconducting layers [2]. We deal with different phenomena occurring because of both the electronic and the magnetic couplings between the layers. In particular, the electronic coupling is shown to cause the enhancement/depression of the local superfluid density in correspondence with the magnetic structure topology in the manganite film. Possible charge-transfer mechanisms occurring between the manganite and the superconducting layers in dependence on the observed local magnetic order are discussed. Moreover, we present evidence of the spontaneous vortex nucleation and of the vortex guidance phenomenon due to the magnetic interaction exerted on the superconductor by the local manganite domain arrangement [1]. In this respect, we discuss about reliable approaches to engineer the vortex guidance phenomenon in all perovskite heterostructures by means of structural defects and/or by suitable external magnetic field.

[1] F. Laviano et al., Appl. Phys. Lett. 86 (2005) 152501.
[2] L. Gozzelino et al., Supercond. Sci. Technol. 19 (2006) S50.

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