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Magneto-Optics of Spontaneous and Field Induced Vortices in Twinned YBa_2Cu_3O_{7-δ}/La_{1-x}Sr_xMnO_3 Bilayers

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Gerbaldo R., Ghigo G., Gozzelino L., Laviano F., Mezzetti E., Minetti B., Przysłupski P., Tsarou A., Wiśniewski A.

Acta Physica Polonica A

2007

vol. 111

issue 1

47-55

The electromagnetic coupling between the magnetic and the superconducting layers in perovskite heterostructures is investigated by means of the magneto-optical technique. The quantitative imaging of the magnetic field distribution allows the high-resolution reconstruction of local supercurrent density. Two phenomena arising from the coupling between manganite layer and the YBa_2Cu_3O_{7-δ} superconducting film deposited on top are addressed, i.e., the local effects of the electronic coupling between the compounds and the interaction between the manganite magnetic moments and the vortices in the superconductor. The first issue can be quantified in terms of the local superfluid density depression/enhancement in correspondence to the underlying magnetic structure, both domains and domain walls (in dependence on the orientation and sign of the local magnetization) and of the spontaneous, macroscopic screening current loops generated by the manganite domain walls. The interaction between the local manganite magnetization and the superconducting vortices is also influenced by structural defects because they modulate the magnetic pattern of the manganite. Different channelling phenomena in correspondence to the natural twin boundaries of the substrate, but locally magnetized by pinned domain walls of the manganite on their locations, are recognized.

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1 Acta Physica Polonica A

1 2007

1 Gerbaldo R.

1 Ghigo G.

1 Gozzelino L.

1 Laviano F.

1 Mezzetti E.

1 Minetti B.

1 Przysłupski P.

1 Tsarou A.

1 Wiśniewski A.

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Magneto-Optics of Spontaneous and Field Induced Vortices in Twinned YBa_2Cu_3O_{7-δ}/La_{1-x}Sr_xMnO_3 Bilayers