Schematic illustration of the YBCO monolayer and the YBCO/DyBCO multilayers: bilayer and trilayer.
Top row: [(a)–(c)] images of the YBCO monolayer film acquired by SEM (a) and AFM showing the as-grown morphology (b), and after chemical etching (c). Middle row: images of the YBCO/DyBCO bilayer film. Bottom row: images of the YBCO/DyBCO trilayer film. AFM images are each.
XRD patterns of the YBCO monolayer and YBCO/DyBCO multilayers. For comparison, the XRD pattern of a 600 nm DyBCO monolayer film is included (topmost). The inset shows the magnified (002) peak of the DyBCO monolayer film.
Magnetic-field angular dependence of at (a), 0.5 T (b), 2.0 T (c), and 4.0 T (d) for the films of various structures: monolayer, bilayer, and trilayer. Significantly improved performance at all angles can be seen for the multilayer films. In (b), the data for an thick YBCO monolayer film is included for comparison (monolayer 2).
Scaling of at 77.3 K assuming : (a) YBCO monolayer, (b) YBCO/DyBCO bilayer, and (c) YBCO/DyBCO trilayer.
Angular-dependent at 77.3 K and 0.5 T for the (a) YBCO monolayer, (b) YBCO/DyBCO bilayer, and (c) YBCO/DyBCO trilayer. The random pinning contribution, is indicated as the solid line in each plot.
Angular-dependent at 77.3 K and 4.0 T for the (a) YBCO monolayer, (b) YBCO/DyBCO bilayer, and (c) YBCO/DyBCO trilayer. The random pinning contribution, is indicated as a solid line in each plot.
, normalized height at for the YBCO monolayer, and the YBCO/DyBCO multilayers. Among the three, the trilayer film exhibits the largest .
Summary of relevant characterization data of representative YBCO/DyBCO multilayer and YBCO monolayer films: , .
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