低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
研究論文
電子ビーム蒸着法により作製した MgB2/Ni 多層薄膜の磁束ピンニング特性
米倉 健志梶田 龍藤吉 孝則末吉 哲郎土井 俊哉北口 仁淡路 智渡辺 和雄
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2008 年 43 巻 8 号 p. 360-364

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Flux pinning properties of multilayered MgB2/Ni thin film prepared by an electron beam evaporation method were investigated. The MgB2/Ni thin film shows the peak around the matching magnetic field in the magnetic field dependence of Jc when the magnetic field is applied in the direction parallel to the surface of the thin film. The strong peak also appears at the B // surface in the field angular dependence of Jc. These results indicate that Ni layers work as two-dimensional pinning centers. Electric field vs. current density characteristics were measured in various magnetic fields and temperatures to obtain the vortex glass-liquid transition temperature Tg and the m-value. The value of Tg at the B // surface was much larger than that of Tg at the B ⊥ surface. The magnetic field dependence of m-value changes drastically at the matching magnetic field when the magnetic field is applied in the direction parallel to the thin-film surface.

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© 2008 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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