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Resumen:
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The field of transition metal oxide (TMOs) is expanding rapidly in recent years, due to the large variety of solid state phases (superconducting, ferromagnetic, multiferroic, metallic, insulating, etc.) coexisting or competing in rich phase diagrams with very similar characteristic energies [1–5]. The discovery of both, high critical temperature superconductors (HTS) [6,7] and colossal magnetoresistance (CMR) materials [4,8], has opened exciting avenues towards potential applications in nanoelectronics and spintronics. In particular, epitaxial thin-film properties of oxide heterostructures are being intensely investigated, because of the novel and interesting properties related with the interfaces phenomena [9,10]. Nevertheless, the hardness, high growth temperature and complex chemistry make nanostructuring processes intrinsically difficult in oxides, what has converted the design of oxide-based nanodevices in a big challenge. The filling of this gap is one of the purposes of this P.h.D. thesis work. Special attention will be paid to the effect of nanostructuring in modifying specific bulk properties of the material when its dimensions are reduced to make them comparable to the specific characteristic lengths of the physical phenomena under study. Different hybrid heterostructures were explored throughout this thesis work. The development of new strategies of TMOs nanofabrication, which preserves all the pristine material properties, provided the possibility to investigate a wide range of novel effects at the range of characteristic length scale of the phenomena. All the experiments highlighted the key role played by complex oxides interfaces. We aim at, designing and engineering a new class of spintronics nanodevices based on complex transition metal oxides. In particular we will examine novel hybrid organic/oxide and superconductor/ferromagnetic planar nanostructures...
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