Two-dimensional flux pinning in multilayered MgB2/Ni thin films prepared by electron beam evaporation

K. Yonekura, R. Kajita, T. Fujiyoshi, T. Sueyoshi, T. Doi, H. Kitaguchi, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Multilayered MgB2/Ni thin films on Si substrates by electron beam evaporation were fabricated to enhance the critical current density Jc in magnetic fields parallel to the surface. The magnetic field dependence of Jc of the multilayered MgB2/Ni thin films for B//surface shows a peak at the matching field. In the field angular dependence of Jc, a sharp peak appears at B//surface. These results indicate that Ni layers which have ferromagnetism act as two-dimensional pinning centers in multilayered MgB2/Ni thin films. The vortex glass-liquid transition temperature Tg and the pinning parameter m were evaluated from the E-J characteristics. The slope of the magnetic field dependence of m in the multilayered MgB2/Ni thin film under the matching field is larger than that over the matching field. In the Tg/Tc-B phase diagram, the remarkable enhancement of Tg for B//surface appears around the matching field. These features are characteristic behaviors for two-dimensional pinning centers.

Original languageEnglish
Pages (from-to)1567-1570
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - 2009 Oct 15

Keywords

  • MgB
  • Multilayered thin films
  • Two-dimensional pinning center

ASJC Scopus subject areas

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

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