Monotonic decrease of Tcs with thinning of the superconducting MgB2 layer in MgB2/Ni and MgB2/B alternately-layered thin films

T. Doi, H. Kitaguchi, Satoshi Hata, K. Fukuyama, K. Masuda, K. Takahashi, T. Yoshidome, Y. Hakuraku, N. Kuwano

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We prepared MgB2/Ni and MgB2/B alternately-layered films using electron beam evaporation and coaxial vacuum arc evaporation techniques without any post-annealing. The thickness of each MgB2 layer was designed to be 42, 24 or 15nm for both MgB2/Ni and MgB 2/B alternately-layered films. We confirmed that the layered structure was successfully obtained from the scanning transmission electron microscopic cross-sectional image of the MgB2/Ni alternately-layered film. The critical temperature, Tc, of the alternately-layered film decreased as the MgB2 layer became thinner, for both MgB 2/Ni and MgB2/B films. Moreover, the Tc was affected by only the MgB2 layer thickness, and was independent of the inserted layer materials.

Original languageEnglish
Pages (from-to)1223-1227
Number of pages5
JournalSuperconductor Science and Technology
Volume20
Issue number12
DOIs
Publication statusPublished - Dec 1 2007

Fingerprint

Thin films
thin films
Evaporation
evaporation
Electron beams
critical temperature
arcs
Vacuum
electron beams
Annealing
Scanning
vacuum
annealing
scanning
Electrons
electrons
Temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Monotonic decrease of Tcs with thinning of the superconducting MgB2 layer in MgB2/Ni and MgB2/B alternately-layered thin films. / Doi, T.; Kitaguchi, H.; Hata, Satoshi; Fukuyama, K.; Masuda, K.; Takahashi, K.; Yoshidome, T.; Hakuraku, Y.; Kuwano, N.

In: Superconductor Science and Technology, Vol. 20, No. 12, 01.12.2007, p. 1223-1227.

Research output: Contribution to journalArticle

Doi, T. ; Kitaguchi, H. ; Hata, Satoshi ; Fukuyama, K. ; Masuda, K. ; Takahashi, K. ; Yoshidome, T. ; Hakuraku, Y. ; Kuwano, N. / Monotonic decrease of Tcs with thinning of the superconducting MgB2 layer in MgB2/Ni and MgB2/B alternately-layered thin films. In: Superconductor Science and Technology. 2007 ; Vol. 20, No. 12. pp. 1223-1227.
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AU - Doi, T.

AU - Kitaguchi, H.

AU - Hata, Satoshi

AU - Fukuyama, K.

AU - Masuda, K.

AU - Takahashi, K.

AU - Yoshidome, T.

AU - Hakuraku, Y.

AU - Kuwano, N.

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AB - We prepared MgB2/Ni and MgB2/B alternately-layered films using electron beam evaporation and coaxial vacuum arc evaporation techniques without any post-annealing. The thickness of each MgB2 layer was designed to be 42, 24 or 15nm for both MgB2/Ni and MgB 2/B alternately-layered films. We confirmed that the layered structure was successfully obtained from the scanning transmission electron microscopic cross-sectional image of the MgB2/Ni alternately-layered film. The critical temperature, Tc, of the alternately-layered film decreased as the MgB2 layer became thinner, for both MgB 2/Ni and MgB2/B films. Moreover, the Tc was affected by only the MgB2 layer thickness, and was independent of the inserted layer materials.

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