Abstract
The anisotropy of flux pinning in three industrially produced coated conductor tapes has been investigated by analyzing the angular dependence of critical current (Ic) in an applied magnetic field. Commercial coated conductors from the SuperOx, SuNAM and Superpower companies were included in the study, which covered range of small applied magnetic fields (0.3–2 T) and temperatures close to liquid nitrogen boiling point (65–77 K). Measurements were performed in the full 360° angular range using samples of the full 4 mm nominal width. The results were analyzed in the framework of the maximum entropy approach-based vortex path model that provided analytical functions fitting remarkably well with the experimental data for all three conductors. Several angular-dependent pinning mechanisms detected in the analysis were tentatively linked with defect structures reported in the literature. The asymmetry of the angular Ic dependence is discussed as well as different Ic values in the two possible orientations of magnetic field applied parallel to the flat face of the coated conductor, observed mostly at lower applied fields.
Published Version
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