Ferromagnetism and superconductivity are long range ordering principles with a mutual exclusion in homogeneous systems. However, if they are spatially separated as in thin film heterostructutres and superlattices both properties are appearing simultaneously and their interaction can be studied. Heterostructures and superlattices consisting of the half-metal ferromagnet La_0.67Ca_0.33MnO₃ and superconducting YBa₂Cu₃O₇ layers were fabricated by pulsed laser deposition techniques and their magnetic as well as electronic interaction were studied by a variety of techniques ranging from transport measurements to magnetic, neutron diffraction and XMCD analysis. It turns out that at the interface interaction effects are taking place at two different length scales. One is based on the self-injection of spin-polarized quasiparticles with a length scale of ~10 nm, the other is a short range exchange interaction with a length scale of ~3 nm. Furthermore, it could be shown that an so far unknown coupling of adjacent magnetic layers occurs when the superlattices are cooled through the superconducting transition temperature.

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1. Tailoring magnetic anisotropy in doped LaMnO₃ thin films