Giant magnetoresistance and exchange-bias in oxide-based metallic multilayers

M. GRANADA; J. C. ROJAS SÁNCHEZ; L. B. STEREN

Buenos Aires, Argentina

Workshop; At the Frontiers of Condensed Matter IV; 2008

In the last years there has been much research in the area of materials for spintronics applications. Due to the wide variety of oxides available with different electric and magnetic properties, one approach to the problem is to develop heterostructures fully composed of  oxides. These materials can be combined to form multilayers with good quality interfaces, allowing the fabrication of multifunctional systems. Our group has been recently involved in the fabrication and study of La0.75Sr0.25MnO3 (LSMO) / LaNiO3 (LNO) multilayers, being LSMO a ferromagnetic manganite and LNO a Pauli paramagnet, both materials presenting a metallic behaviour below room temperature. In this talk, an overview of the magnetic and electric properties of films, trilayers and superlattices composed of these materials will be presented. Besides from a giant magnetoresistance effect measured at low temperature, we have observed an unexpected exchange-bias like behaviour.