低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
研究論文
Ni層間隔を変化させて作製したMgB2/Ni多層膜の作製と超伝導特性
田中 章土井 俊哉岩崎 育美白樂 善則北口 仁高橋 健一郎波多 聰
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2009 年 44 巻 12 号 p. 603-611

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We will show the superconducting properties of alternately-layered MgB2/Ni thin films inserted as very thin (1 nm) nickel layers between MgB2 layers a few tens of nanometers thick. The MgB2/Ni thin films were prepared on silicon (100) substrates by sequentially switching electron-beam evaporation and coaxial vacuum arc evaporation techniques without post-annealing. In this study, we prepared alternately layered MgB2/Ni thin films with varying Ni-layer spacings. The Ni layer spacings were set to 32, 23 and 16 nm, respectively. The MgB2/Ni thin films were neither inter-diffusion nor chemical reactions between MgB2 and Ni. Clear enhancements of the Jc were observed in the MgB2/Ni thin films when the magnetic fields were applied parallel to the inserted Ni layers, and the peak positions in the Fp–B curves shifted to higher magnetic fields with the decrease of the Ni-layer spacing. These results clearly indicate that the Ni layers inserted in alternately-layered MgB2/Ni thin films work as very effective flux-pinning centers.

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© 2009 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)
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