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Comparison of the Shielding Properties of Superconducting and Superconducting/Ferromagnetic Bi- and Multi-layer Systems

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Abstract

This paper compares the shielding properties of superconducting (SC) and superimposed superconducting/ferromagnetic (SC/FM) systems, consisting of cylindrical cups with an aspect ratio of height/radius close to unity. Both bilayer structures, with the SC cup placed inside the FM one, and multilayer structures, made up of two SC and two FM alternating cups, have been considered. Induction magnetic field values have been calculated by means of a finite element model based on the vector potential formulation, simultaneously taking into account the non-linear properties of both the SC and FM materials. The analysis highlights that at low applied fields, the presence of a height difference between the edges of the SC/FM cups, as well as a suitable choice of the lateral gap between the cups, is a key factor in obtaining hybrid structures with a shielding potential comparable to, or even higher than, that of the single SC cup. In contrast, at high applied fields, all the hybrid arrangements investigated always provide much greater shielding factors than the SC cup alone. The computation results show that at both low and high applied fields, the multilayer solutions are the hybrid shields with the highest efficiency.

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Notes

  1. The shielding factor produced by a magnetic shield is evaluated as the ratio between the magnetic flux density values measured/calculated in the same point without and with the shield (i.e. μ 0 H appl/ B).

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Acknowledgments

We wish to thank F. Gömöry for fruitful discussions. This work was partially supported by the Italian National Institute of Nuclear Physics (INFN) under SR2S-RD experiment.

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Authors and Affiliations

  1. Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy

    L. Gozzelino, R. Gerbaldo, G. Ghigo & F. Laviano

  2. Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy

    L. Gozzelino, R. Gerbaldo, G. Ghigo, F. Laviano & M. Truccato

  3. Department of Physics and Nanostructured Interfaces and Surfaces Centre, Università di Torino, Via P. Giuria 1, 10125, Torino, Italy

    M. Truccato

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  1. L. Gozzelino
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  2. R. Gerbaldo
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  3. G. Ghigo
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  4. F. Laviano
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  5. M. Truccato
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Correspondence to L. Gozzelino.

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Gozzelino, L., Gerbaldo, R., Ghigo, G. et al. Comparison of the Shielding Properties of Superconducting and Superconducting/Ferromagnetic Bi- and Multi-layer Systems. J Supercond Nov Magn 30, 749–756 (2017). https://doi.org/10.1007/s10948-016-3659-z

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  • DOI: https://doi.org/10.1007/s10948-016-3659-z

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