Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Formation of $ZrO_2$ nanodots for the enhanced flux pinning properties in high $T_c$ superconducting films

초전도 자속고정 특성 향상을 위한 $ZrO_2$ 나노점의 형성 연구

  • 정국채 (한국기계연구원 부설 재료연구소) ;
  • 유재무 (한국기계연구원 부설 재료연구소) ;
  • 김영국 (한국기계연구원 부설 재료연구소) ;
  • 이혜문 (한국기계연구원 부설 재료연구소) ;
  • ;
  • Published : 2008.03.31
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Abstract

To achieve high transport current without degradation under magnetic field, it is essential to artificially generate the pinning sites at which moving magnetic flux can be pinned. In this work, $ZrO_2$ nanodots were formed on the substrate surface using electro-spray deposition method. On top of the nanodots, the extended and effective pinning centers can be created. The positively charged Zr precursor solution was sprayed out from the needle using the corona discharge phenomena. Then, the sprayed precursor was deposited onto the negatively charged substrate surface followed by the heat treatment under the controlled atmosphere. Using the electrostatic force among the charged particles of precursor, evenly distributed and nano-sized dots were formed on the substrate surface. The size and density of the nanodots were studied by Atomic Force Microscopy. Also discussed are the effect of the deposition time and solution concentration on the size and density of the nanodot and processing variables in electro-spray method for the effective flux pinning centers in the superconducting films.

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References

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