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Flux-pinning properties of superconducting films with arrays of blind holes

S. Raedts, A. V. Silhanek, M. J. Van Bael, and V. V. Moshchalkov
Phys. Rev. B 70, 024509 – Published 19 July 2004
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  • INTRODUCTION
  • EXPERIMENTAL ASPECTS
  • RESULTS AND DISCUSSION
  • CONCLUSION
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    We performed ac susceptibility measurements to explore the vortex dynamics and the flux-pinning properties of superconducting Pb films with an array of microholes (antidots) and not fully perforated holes (blind holes). A lower ac shielding together with a smaller extension of the linear regime for the lattice of blind holes indicates that these centers provide a weaker pinning potential than antidots. Moreover, we found that the maximum number of flux quanta trapped by a pinning site, i.e., the saturation number ns, is lower for the blind hole array.

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    • Received 19 March 2004

    DOI:https://doi.org/10.1103/PhysRevB.70.024509

    ©2004 American Physical Society

    Authors & Affiliations

    S. Raedts, A. V. Silhanek, M. J. Van Bael, and V. V. Moshchalkov

    • Nanoscale Superconductivity and Magnetism Group, Laboratory for Solid State Physics and Magnetism, K. U. Leuven Celestijnenlaan 200 D, B-3001 Leuven, Belgium

    See Also

    Superconducting vortex state in a mesoscopic disk containing a blind hole

    G. R. Berdiyorov, M. V. Milošević, B. J. Baelus, and F. M. Peeters
    Phys. Rev. B 70, 024508 (2004)

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    Vol. 70, Iss. 2 — 1 July 2004

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    • Figure 1
      Figure 1
      (a) Atomic force micrograph (AFM) of a 5×5μm2 area of a Pb film with a square array of square blind holes. (b) Schematic cross section of the patterned superconducting samples studied in this work, a blind hole sample B and an antidot sample A. The two evaporated Pb layers L1 and L2 are indicated.Reuse & Permissions
    • Figure 2
      Figure 2
      Screening χ′ as function of temperature T for set 1 of Pb films with an array of antidots (A, open circles), blind holes (B, filled circles), and a reference plain Pb film with the same thickness as layer L2 (triangles), with H=5Oe, f=3837Hz, and h=6mOe. Inset: χ′ as a function of T measured on blind hole sample B with the plain Pb contour progressively removed.Reuse & Permissions
    • Figure 3
      Figure 3
      Screening χ′ and dissipation χ″ for films of set 1 with an array of antidots (open circles) and blind holes (thick solid line) as a function of H∕H1 for T=Tc2=7.10K and h=0.23Oe. The inset shows the χ′(T) transition for blind hole sample B, indicating the two possible saturation values used in the normalization of the signal χ′.Reuse & Permissions
    • Figure 4
      Figure 4
      Screening χ′ as function of H∕H1 for Pb films of set 1 with an array of blind holes (filled symbols) and antidots (open symbols) with (a) T=7K<Tc2 and h=0.49Oe and (b) T=7.18K>Tc2 and h=0.03Oe.Reuse & Permissions
    • Figure 5
      Figure 5
      Screening χ′ and dissipation χ″ as a function of H∕H1, for Pb films of set 2 with an array of antidots (open circles) and blind holes (filled circles) for T=7.07K, f=3837Hz, and h=0.5Oe. The inset shows the temperature dependence of the normalized screening χ′ for the samples A and B.Reuse & Permissions
    • Figure 6
      Figure 6
      (a) Dissipation χ″ as function of the ac field h for an array of antidots at several T, f=3837Hz, and H=5Oe. Arrows indicate the onset of the nonlinear response according to the chosen criterium χ″=0.05 (horizontal line). (b) Phase boundary of the linear regime for samples A and B of set 1, for H=5Oe and f=3837Hz. This boundary is obtained using a dissipation criterium χ″=0.05, as shown in (a) for antidot sample A. The continuous line indicates the boundary of the linear regime for a reference nonpatterned Pb film with the same thickness as layer L2.Reuse & Permissions
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