  We studied the structural, magnetic and transport properties of
LaAlO3/EuTiO3/SrTiO3 heterostructures grown by Pulsed Laser Deposition. The
samples have been characterized in-situ by electron diffraction and scanning
probe mi-croscopy and ex-situ by transport measurements and x-ray absorption
spectroscopy. LaAlO3/EuTiO3/SrTiO3 films show a ferromagnetic transition at
T<7.5 K, related to the ordering of Eu2+ spins, even in samples characterized
by just two EuTiO3 unit cells. A finite metallic conductivity is observed only
in the case of samples composed by one or two EuTiO3 unit cells and,
simultaneously, by a LaAlO3 thickness equal or above 4 unit cells. The role of
ferromagnetic EuTiO3 on the transport properties of delta-doped
LaAlO3/EuTiO3/SrTiO3 is critically discussed.
