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Magnetic pinning effects of epitaxial La x Sr1−x MnO3 nanostructured thin films on YBa2Cu3O7−δ layers
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View: Figures


Image of FIG. 1.
FIG. 1.

2 AFM image of the terraced (001) STO substrate (upper panel); typical profile of the substrate (middle panel); 2 AFM image of the LSMO buffer layer, LSMO grain width corresponds to the STO terrace width, as shown by the dotted lines (lower panel).

Image of FIG. 2.
FIG. 2.

scans of the single YBCO film deposited on the STO substrate and of the YBCO/LSMO bi-layer. (00l) peaks correspond to the epitaxial YBCO films.

Image of FIG. 3.
FIG. 3.

-scans around the (002) reflections of the two YBCO films (circles) and the corresponding simulations (lines).

Image of FIG. 4.
FIG. 4.

Magnetization curves of the single YBCO film (open circles), the LSMO/YBCO bi-layer (open squares) measured at 70 K, and their corresponding fits (solid lines).

Image of FIG. 5.
FIG. 5.

Magnetic field dependence of the critical current density, , as deduced from Eq. (1), at 10, 40, and 70 K.

Image of FIG. 6.
FIG. 6.

Temperature dependence of the irreversibility field, , of the two YBCO samples.

Image of FIG. 7.
FIG. 7.

f(h) dependencies at different temperatures for (a) the single YBCO film and (b) for the YBCO layer deposited on the LSMO buffer (open symbols). Scaling law fit (solid lines), Eq. (2), of f(h) for (a) the single YBCO film at 50 K and (b) for the buffered YBCO film for all the studied temperatures.

Image of FIG. 8.
FIG. 8.

Scaling law, Eq. (2), parameter p evolution as a function of temperature for the two YBCO films.

Image of FIG. 9.
FIG. 9.

variation in an applied external field of 3.5 T for the two YBCO films; (inset) , see Eq. (3), calculated at different temperatures for an applied field of 3.5 T.

Image of FIG. 10.
FIG. 10.

Schematic presentation of the origin of , three-dimensional AFM image of the LSMO buffer layer surface, which, at saturation, may correspond to that of the magnetic vortex pinning potential, , within the YBCO film deposited on top.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic pinning effects of epitaxial LaxSr1−xMnO3 nanostructured thin films on YBa2Cu3O7−δ layers