Flux pinning properties of MgB2 thin films on ti buffered substrate prepared by molecular beam epitaxy

K. Yonekura, A. Kugo, T. Fujiyoshi, T. Sueyoshi, Y. Harada, M. Yoshizawa, T. Ikeda, S. Awaji, K. Watanabe

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Transport properties of the MgB2 thin films on Si, MgO and ZnO substrates with Ti buffer layer prepared by molecular beam epitaxy were investigated to clarify effects of the substrates and the Ti buffer layer on flux pinning. The critical current density Jc of each sample shows different dependence on magnetic fields parallel to c-axis. However, the scaling analysis of the macroscopic pinning force for all the measured samples implies that the grain boundaries work as the dominant pinning centers for B//c. The pinning parameter for MgB2/Ti/Si estimated from the electric field E vs. the current density J characteristics shows the highest value among all the measured samples. This result is attributed to the high density of grain boundaries caused by the effect of both the Ti buffer and Si substrate in the growth process. Therefore, the selection of substrates and buffer layer strongly affects the flux pining properties of MgB2 thin films and plays an important role in the determination of performance for superconducting devices and wires.

Original languageEnglish
Pages (from-to)1461-1464
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume470
Issue number20
DOIs
Publication statusPublished - 2010 Nov 1

Keywords

  • Critical current density
  • Grain boundary
  • Ti buffer layer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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