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Magneto-optical investigation of the electromagnetic interaction in twinned YBa2Cu3O7-d/La1-xSrxMnO3 bilayers

Roberto Gerbaldo 1Gianluca Ghigo 1Laura Gozzelino 1Francesco Laviano 1Enrica Mezzetti 1Bruno Minetti 1Piotr Przyslupski 2Andrei Tsarou 2Andrzej Wisniewski 2

1. Dipartimento di Fisica, Politecnico di Torino, corso Duca degli Abruzzi, 24, Torino 10129, Italy
2. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland


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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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium K, by Enrica Mezzetti
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-23 22:00
Revised:   2009-06-07 00:44