Magneto-optical characterisations of YBa₂Cu₃O_7-x films grown on top of La_1-xSr_xMnO₃ layers are presented. This analysis is focused on the study of the magnetic interaction exerted on vortices in YBa₂Cu₃O_7-x films by the manganite magnetic structures. The twin boundaries in the LaAlO₃ substrate induce splitting of the manganite magnetic domains with in-plane magnetization that are separated by out-of-plane magnetic structures, pinned at twin boundaries [1]. The vortices nucleated by the external magnetic field interact with the underlying out-of-plane magnetic moments depending on their local structure and magnetic polarization. By the inversion of the Biot-Savart law, the effects of the underlying magnetic structure on local current densities in YBa₂Cu₃O_7-x films are evaluated. Different blocking mechanisms (sink or reservoir) are found for current parallel to twin-boundaries, whereas for current perpendicular to the out-of-plane magnetic structures either blocking or channelling effect is achieved. These channelling/blocking phenomena are fundamental for magnetic-quanta control in hybrid superconducting/ferromagnetic devices for spintronics.

Work partially supported by the Programme of Scientific and Technological Co-operation between the Italian Republic and the Republic of Poland 2004-2006. The Italian members of the working group also acknowledge the contribution of the MIUR-PRIN project n. 2004037901.

[1] F. Laviano, L. Gozzelino, E. Mezzetti, P. Przyslupski, A. Tsarev, and A. Wisniewski Appl. Phys. Lett. 86, 152501 (2005).

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