5 July 1996 Confinement of the flux-line lattice in nanostructured superconducting films and multilayers
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We have studied the flux-line confinement by a triangular and square array of submicron holes (antidots) in superconducting films (Pb, WGe) and multilayers (Pb/Ge). For large antidots, sharp cusp-like magnetization anomalies appear at the matching fields Hm, caused by the formation of multi-quanta vortices at each subsequent Hm. Critical current density jc and pinning force fp are strongly enhanced due to the pinning of single- or multiple-quanta vortices by the antidots. For relatively small antidots, new composite flux-line lattices, consisting of single- or multi-quanta vortices at antidots and single vortices at the interstices are observed at temperatures close to the critical temperature. The measurements of jc and fp for several antidot radii demonstrate that pinning centers with a size considerably larger than the coherence length are very efficient.
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Yvon Bruynseraede, Yvon Bruynseraede, Vitaly V. Metlushko, Vitaly V. Metlushko, K. Temst, K. Temst, M. Baert, M. Baert, E. Rosseel, E. Rosseel, M. J. Van Bael, M. J. Van Bael, Victor V. Moshchalkov, Victor V. Moshchalkov, } "Confinement of the flux-line lattice in nanostructured superconducting films and multilayers", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250246; https://doi.org/10.1117/12.250246

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