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Artificial Pinning Centers on MgB2 Superconducting Thin Films Coated by FeO Nanoparticles

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Abstract

MgB2 thin films were fabricated on MgO (100) single crystal substrates. First, deposition of boron was performed by rf magnetron sputtering on MgO substrates and followed by a post deposition annealing at 850 °C in magnesium vapor. In order to investigate the effect of FeO nanoparticles on magnetic properties of MgB2 thin films, the films were coated with different concentrations of FeO nanoparticles by spin coating process. The magnetic field dependence of the critical current density \(J_{\mathrm{c}}\) was calculated from the M–H loops and also magnetic field dependence of the pinning force density \(f_{\mathrm{p}}(b)\) was determined for the films containing different concentrations of FeO nanoparticles. The values of the critical current density \(J_{\mathrm{c}}\) in zero field at 5 K was found to be around 1×106 A/cm2 for pure MgB2 film, 1.4×106 for MgB2 film coated with 25 %, 7.2×105 for MgB2 film coated with 33 %, 9.1×105 for MgB2 film coated with 50 % and 1.1×106 A/cm2 for MgB2 film coated with 100 %. It was found that the film coated with 25 % FeO nanoparticles has slightly enhanced critical current density and it can be noted that especially the film coated with 25 % FeO became stronger in the magnetic field. The films coated with FeO were successfully produced and they indicated the presence of artificial pinning centers created by FeO nanoparticles. The superconducting transition temperature of the film coated with 25 % FeO nanoparticles was determined by moment–temperature (M–T) measurement to be 34 K which is 4 K higher than that of the pure film.

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Acknowledgements

The authors acknowledge Dr. E. Scutelnic (at the Academy of Sciences of Moldova) for technical assistance. This work was supported by the Council of Higher Education (Turkey) and Scientific Research Coordination Unit of Karadeniz Technical University (Contract No. 2010.111.001.2).

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Authors and Affiliations

  1. Physics Department, Karadeniz Technical University, Trabzon, 61080, Turkey

    E. Taylan Koparan & E. Yanmaz

  2. Institute of Electronic Engineering and Industrial Technologies ASM, 2028, Chisinau, Republic of Moldova

    E. Taylan Koparan, A. Surdu, A. Awawdeh & A. Sidorenko

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  1. E. Taylan Koparan
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  2. A. Surdu
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  3. A. Awawdeh
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  4. A. Sidorenko
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  5. E. Yanmaz
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Correspondence to E. Taylan Koparan.

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Taylan Koparan, E., Surdu, A., Awawdeh, A. et al. Artificial Pinning Centers on MgB2 Superconducting Thin Films Coated by FeO Nanoparticles. J Supercond Nov Magn 25, 1761–1767 (2012). https://doi.org/10.1007/s10948-012-1533-1

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  • DOI: https://doi.org/10.1007/s10948-012-1533-1

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