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Dissipation in Superconductor/Ferromagnet Multilayers for AC Magnetic Cloaking

Abstract

Multilayer structures combining superconducting (SC) and ferromagnetic (FM) sheets could be utilized to make the magnetic invisibility cloak. Such device is able to hide magnetic object in external applied field without being noticed by magnetic measurement. Because of magnetic hysteresis of both the components in the SC/FM multilayer, a dissipation of electromagnetic energy takes place when it is exposed to a magnetic field changing in time. With the help of the numerical procedure developed for this purpose, we have designed and tested several magnetic cloaks. Coated conductors were used as the superconducting elements. Two kinds of ferromagnetic materials have been utilized: the iron alloy sheet containing 18 % of Cr and 9 % of Ni and the metallic glass ribbon prepared by rapid quenching of the melt Fe-Si-B-Cu-Nb composition. Detectability in AC magnetic fields was tested in the setup allowing to see both screening and dissipation signals. Magnetization loops of the cloak were calculated to explain the observed dissipative behavior.

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Acknowledgments

This work was supported by the Slovak Research and Development Agency under the contract no. APVV-0623-12.

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Correspondence to F. Gömöry.

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Gömöry, F., Solovyov, M., Šouc, J. et al. Dissipation in Superconductor/Ferromagnet Multilayers for AC Magnetic Cloaking. J Supercond Nov Magn 28, 725–729 (2015). https://doi.org/10.1007/s10948-014-2655-4

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  • DOI: https://doi.org/10.1007/s10948-014-2655-4

Keywords

  • Superconducting/ferromagnetic composite
  • Magnetic cloaking
  • Type II superconductors
  • High-temperature superconductivity