N. Mestres

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Self-assembly of oxides as a bottom-up approach to functional nanostructures goes beyond the conventional nanostructure formation based on lithographic techniques. Particularly, chemical solution deposition (CSD) is an ex situ growth approach very promising for high throughput nanofabrication at low cost. Whereas strain engineering as a strategy to define(More)
Power applications of superconductors will be tremendously boosted if an effective method for magnetic flux immobilization is discovered. Here, we report the most efficient vortex-pinning mechanism reported so far which, in addition, is based on a low-cost chemical solution deposition technique. A dense array of defects in the superconducting matrix is(More)
This review summarizes the capabilities and recent developments of nanoporous polymeric template systems directly supported on different substrates for the confined growth of epitaxial ferromagnetic complex oxide 1D nanostructures. In particular, we describe the versatility and potentiality of chemical solutions combined with track-etched polymers to(More)
1 Centro de Investigación en Química Biológica y Materiales Moleculares, Universidad de Santiago de Compostela, Santiago de Compostela, Spain, 2 Institut des Nanotechnologies de Lyon, Centre National de la Recherche Scientifique École Centrale de Lyon, Lyon, France, 3 Consejo Superior de Investigaciones Científicas, Institut de Ciéncia de Materials de(More)
In this study we combine scanning transmission electron microscopy, electron energy loss spectroscopy and electron magnetic circular dichroism to get new insights into the electronic and magnetic structure of LaSr-2×4 manganese oxide molecular sieve nanowires integrated on a silicon substrate. These nanowires exhibit ferromagnetism with strongly enhanced(More)
Porous mixed-valent manganese oxides are a group of multifunctional materials that can be used as molecular sieves, catalysts, battery materials, and gas sensors. However, material properties and thus activity can vary significantly with different synthesis methods or process conditions, such as temperature and time. Here, we report on a new synthesis route(More)
D Analysis of Excess Carrier Concentration Control in Fast-Recovery High Power Bipolar Diodes at Low Current Densities X. Perpiñà, X. Jordà, M. Vellvehi, J. Vobecky, and N. Mestres Instituto de Microelectrónica de Barcelona, IMB-CNM (CSIC), Campus Universitat de la Autònoma de Barcelona, Bellaterra, Barcelona 08193, Spain ABB Switzerland Limited,(More)
We report a chemical solution based method using nanoporous track-etched polymer templates for producing long and oriented LaSr-2 × 4 manganese oxide molecular sieve nanowires. Scanning transmission electron microscopy and electron energy loss spectroscopy analyses show that the nanowires are ferromagnetic at room temperature, single crystalline,(More)
The chemical composition and the magnetic structure of individual La0.7Sr0.3MnO3 (LSMO) ferromagnetic manganite epitaxial nanostructures less than 200 nm in width are explored using Photoemission Electron Microscopy (PEEM). X-ray absorption spectra (XAS) provide separate information on the surface and the bulk composition of the nanoislands and give(More)
We report on the fabrication of hollow iron oxide nanoparticles with large surface to volume ratio by a single step gas condensation process at ambient temperature. Fe clusters formed during the sputtering process are progressively transformed into hollow cuboids with oxide shells, at the expense of oxygen captured inside the deposition chamber by the(More)