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Dynamic regimes in films with a periodic array of antidots

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  • A. Silhanek
  • S. Raedts
  • M. Bael
  • V. Moshchalkov

Abstract

We have studied the dynamic response of Pb thin films with a square array of antidots by means of ac susceptibility χ(T, H) 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. Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2004

Suggested Citation

  • A. Silhanek & S. Raedts & M. Bael & V. Moshchalkov, 2004. "Dynamic regimes in films with a periodic array of antidots," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 37(1), pages 19-24, January.
    • Handle: RePEc:spr:eurphb:v:37:y:2004:i:1:p:19-24:10.1140/epjb/e2004-00026-0
    DOI: 10.1140/epjb/e2004-00026-0
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