Dynamic regimes in films with a periodic array of antidots |
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Authors: | Email author" target="_blank">A?V?SilhanekEmail author S?Raedts M?J?Van?Bael V?V?Moshchalkov |
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Institution: | (1) Laboratory for Solid State Physics and Magnetism K.U. Leuven, Nanoscale Superconductivity and Magnetism Group, Celestijnenlaan 200 D, 3001 Leuven, Belgium |
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Abstract: | We have studied the dynamic response of Pb thin films with a square array of antidots by means of ac susceptibility
measurements. At low enough ac drive amplitudes h, vortices moving inside the pinning potential give rise to a frequency- and h-independent response together with a scarce dissipation. For higher amplitudes, the average distance travelled by vortices surpasses the pinning range and a critical state develops. We found that the boundary h*(H,T) between these regimes smoothly decreases as T increases whereas a step-like behavior is observed as a function of field. We demonstrate that these steps in h*(H) arise from sharp changes in the pinning strength corresponding to different vortex configurations. For a wide set of data at several fields and temperatures in the critical state regime, we show that the scaling laws based on the simple Bean model are satisfied.Received: 13 October 2003, Published online: 19 February 2004PACS:
74.78.Na Mesoscopic and nanoscale systems - 74.25.Sv Critical currents - 74.78.Db Low-Tc films |
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