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Quantitative magneto-optical analysis of out-of-plane magnetic structures in twinned YBa2Cu3O7-x/La1-xSrxMnO3 bilayers
|Laura Gozzelino 2, Danilo Botta 2, Roberto Gerbaldo 2, Gianluca Ghigo 2, Francesco Laviano 2, Bruno Minetti 2, Piotr Przyslupski 1, A Tsarev 1, Andrzej Wisniewski 1, Enrica Mezzetti 2|
1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
Magneto-optical characterisations of YBa2Cu3O7-x films grown on top of La1-xSrxMnO3 layers are presented. This analysis is focused on the study of the magnetic interaction exerted on vortices in YBa2Cu3O7-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 . 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 YBa2Cu3O7-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.
 F. Laviano, L. Gozzelino, E. Mezzetti, P. Przyslupski, A. Tsarev, and A. Wisniewski Appl. Phys. Lett. 86, 152501 (2005).
Presentation: oral at E-MRS Fall Meeting 2005, Symposium D, by Laura Gozzelino
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-20 11:50 Revised: 2009-06-07 00:44