Month: October 2013

Ferromagnetic 1D oxide nanostructures grown from chemical solutions in confined geometries

ferromagnetic
Chem. Soc. Rev., 2013
DOI: 10.1039/C3CS60288E
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 synthesize (i) vertical polycrystalline La0.7Sr0.3MnO3 nanorods on top of single crystal perovskites, (ii) single crystalline manganese based octahedral molecular sieve (OMS) nanowires on silicon substrates, and (iii) the epitaxial directional single crystal OMS nanowires on top of fluorite-type substrates. The influence of the distinct growth parameters on the nanostructural evolution of the resulting nanostructures and their magnetic properties is further discussed in detail.

Magnetic and structural characterization of inkjet-printed TFAYBa2Cu3O7−x/MODCZO/ABADYSZ/SS coated conductors

sust485654f4_online E. Bartolome, R. Vlad, A. Calleja, M. Aklalouch, R. Guzman, J Arbiol, X. Granados, A. Palau, X. Obradors, T. Puig and A. Usokin Superconductor Science and Technology 26, 125004 (2013) DOI:10.1088/0953-2048/26/12/125004 The superconductor industry is demanding new methodologies to manufacture km-long, high quality coated conductors at high growth rates, using cost-effective, scalable processes. We report on the fabrication by an all-chemical deposition method of highly textured, thick (0.9 μm) inkjet-printed YBCO films, using a Ce0.9Zr0.1O2 (CZO) capping layer deposited by MOD, on top of robust, buffered ABADYSZ/SS substrates. Thinner, 0.25 μm spin-coated YBCO films were also analyzed for comparison. The structural study performed by x-ray diffraction, optical, AFM, SEM and TEM microscopy demonstrates the success of the capping layer for enhancing the planarity of the as-received tape and obtaining highly homogeneous and well-textured YBCO films. DC magnetometry granularity analysis was used to determine the mean superconducting grain diameter, ~2.5 μm, and the intra- and intergranular critical current densities of the coated conductors (CCs). For the thin, spin-coated sample, high self-field intragrain critical currents were measured (, 3.3 MA cm−2 at 5, 77 K). For the thick, inkjet-printed tape was reduced by ~30%, but, notably, the percolative critical current, , was only ~10% smaller at 5 K, thanks to good preservation of the texture. At 77 K, was achieved, implying a critical current of Ic = 117 A/cm-width. AC susceptibility measurements allowed us to demonstrate the high homogeneity of the fabricated CCs, and investigate the magnetic vortex-pinning phase diagram. Remarkably, the thick, inkjet-printed sample showed comparable irreversibility line (IL) and activation energy for thermal depinning, Ue(H), to the thin sample. The present results open new perspectives for the fabrication of high quality-to-cost ratio, all-chemical CCs with yet higher Ic values by inkjet printing multideposition of thicker YBCO layers.

Institut de Ciència de Materials de Barcelona ICMAB CSIC

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