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Influences of Ferromagnetic Substrate on Microwave Surface Resistance of Type-II Superconductors

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Abstract

The influence of a ferromagnetic substrate on microwave surface resistance of high-temperature superconductors is numerically studied through finite element method computations. For a superconductor with a ferromagnetic substrate underneath, it is observed that an increase in ferromagnet susceptibility results in more shielding of the superconductor from the influence of external magnetic field and, in turn, a fall in microwave surface resistance. The effect saturates with higher susceptibilities where a plateau is reached in the surface resistance curve. As a comparison, coating superconductor with U-shaped ferromagnets on two sides is also considered where an ordinary hysteresis curve in terms of microwave surface resistance is observed for a non-magnetic coating. In contrast, a highly ferromagnetic coating with a relative permeability of 1000 gives rise to an unusual hysteresis behavior.

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Acknowledgments

This study is supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) under the grant number 111T715.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Ahi Evran University, Kırşehir, Turkey

    S. Yildiz

  2. Department of Physics, Yildiz Technical University, Istanbul, Turkey

    F. Inanir

  3. Department of Physics, Faculty of Arts and Science, Mehmet Akif Ersoy University, Burdur, Turkey

    A. Cicek

  4. Department of Electrical Engineering, Jack Baskin School of Engineering, University of California Santa Cruz, Santa Cruz, CA, USA

    A. Cicek

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  1. S. Yildiz
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Correspondence to S. Yildiz.

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Yildiz, S., Inanir, F. & Cicek, A. Influences of Ferromagnetic Substrate on Microwave Surface Resistance of Type-II Superconductors. J Supercond Nov Magn 28, 3205–3209 (2015). https://doi.org/10.1007/s10948-015-3170-y

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  • DOI: https://doi.org/10.1007/s10948-015-3170-y

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