The need of spin-polarized current sources has fuelled the research on half-metallic ferromagnetic oxides during the last decade. Indeed, development on spintronics mainly relies on the availability of sources of spin-polarized carriers that could be ultimately injected into semiconductors of other functional structures. Unfortunately, so far, the half-metallic character of the celebrated manganites can not be exploited in room-applications as the magnetoresistance of magnetic tunnel junctions or related devices decays rapidly with temperature and becomes unpractical. Therefore, efforts have to be directed to development of alternative spin-polarized sources. In this presentation we shall overview our recent developments in this direction. We will illustrate that heterostructures involving thin ferromagnetic oxides tunnel barriers can be successfully used to spin-filter a paramagnetic charge current. We will discus results, and promises of these devices as candidates as key building blocks of magnetoelectric devices.

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