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Preferential diagonal penetration of vortices into square superconducting networks |
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| Authors: | T. Tamegai Y. Tsuchiya Y. Nakajima T. Yamamoto Y. Nakamura J.S. Tsai M. Hidaka H. Terai Z. Wang |
| Affiliation: | 1. Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan;2. NEC Nano Electronics Research Laboratories, Ibaraki 305-8501, Japan;3. Advanced Science Institute, RIKEN, Saitama 351-0198, Japan;4. International Superconductivity Technology Center, Ibaraki 305-8501, Japan;5. National Institute of Information and Communications Technology, Kobe 651-2492, Japan |
| Abstract: | We have observed vortex penetration into Nb thin films with square arrays of square holes with variable sizes and lattice constants. We find that when the lattice spacing is large and the width of superconducting line is narrow, vortices penetrate diagonally rather than parallel to the nearest neighbor direction. This phenomenon is also confirmed in NbTiN samples with the same geometry. We also confirm that the direction of edge relative to that of hole array is not relevant. Possible origin of such a preferential penetration is proposed. |
| Keywords: | Vortex penetration Magneto-optical imaging Anti-dot array Superconducting network |
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