Magneto-optical imaging of the magnetic field distribution in magnetic and superconductor perovskite heterostructures is presented. The real-time high-resolution imaging of the magnetic field distribution by the magneto-optical technique [1] allows the direct visualization of the local electromagnetic interaction between materials with different electronic orders [2]. We report on new nonlinear calibration and background treatment leading to the quantitative imaging of the local magnetic pattern in the magnetic layer and of the local supercurrent density in the superconducting one, with sub-micrometric resolution. In particular, we present the quantitative measurement of the enhancement/depression of the local superfluid density due to the electronic interaction with the underlying magnetic structure exhibited by the manganite layer.

[1] F. Laviano et al., Supercond. Sci. Technol. 16 (2003) 71.

[2] F. Laviano et al., Appl. Phys. Lett. 86 (2005) 152501.

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