Abstract
The flux generated by vortices in a field-cooled ( 10 μT ) wide bicrystal grain boundary junction (GBJ) in a YBa 2Cu 3 O 7− δ thin film was measured at 77 K, using a superconducting thin-film coil and Nb-based superconducting quantum interference device. The sample film was filled with slots, forming a mesh structure. When the field applied to the film was changed above a threshold value, either in positive or negative direction, random switching noise appeared. The switching heights implied long-distance movement of vortices over 20– 500 μm within the GBJ, driven by the shielding current. Almost symmetric threshold fields showed the effectiveness of the mesh structure in reducing demagnetization effect in thin-film geometry. The same slot structure made along the GBJ was also effective to suppress long-distance vortex motion in the GBJ to lengths of less than 1 μm .
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