2009年8月
Two-dimensional flux pinning in multilayered MgB2/Ni thin films prepared by electron beam evaporation
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
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- 巻
- 469
- 号
- 15-20
- 開始ページ
- 1567
- 終了ページ
- 1570
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.physc.2009.05.222
- 出版者・発行元
- ELSEVIER SCIENCE BV
Multilayered MgB2/Ni thin films on Si substrates by electron beam evaporation were fabricated to enhance the critical current density J(c) in magnetic fields parallel to the surface. The magnetic field dependence of J(c) of the multilayered MgB2/Ni thin films for B//surface shows a peak at the matching field. In the field angular dependence of J(c), 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 T-g 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 T-g/T-c-B phase diagram, the remarkable enhancement of T-g for B//surface appears around the matching field. These features are characteristic behaviors for two-dimensional pinning centers. (C) 2009 Published by Elsevier B.V.
- リンク情報
- ID情報
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- DOI : 10.1016/j.physc.2009.05.222
- ISSN : 0921-4534
- eISSN : 1873-2143
- Web of Science ID : WOS:000270018200178