| Project/Area Number |
15560278
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Yamaguchi University |
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Principal Investigator |
HARADA Naoyuki Yamaguchi University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00222232)
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| Co-Investigator(Kenkyū-buntansha) |
HAMAJIMA Takataro Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (00314815)
TSUDA Makoto Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10267411)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Critical Current / Superconducting Wire / Flux Pinning / Microfabrication / Fluxoid / Nano-technology / Nb / Thin Film |
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| Research Abstract |
Practical superconducting wires for power cables and high field magnets require a high critical current density. Effective flux pinning centers are required for the development of these practical superconductors in order to achieve high critical current density. In the case of metallic superconductors, a drawing process introduces artificial pinning centers in metallic superconductors. However, artificial pinning centers cannot be introduced into high-Tc superconductors through the drawing process because these superconductors are brittle. We consider the microfabrication technique, instead of the drawing process, in order to introduce artificial pinning centers into the superconductors. Groove-shaped artificial pinning centers and hole-shaped artificial pinning centers are introduced into 0.22-0.5μm thick evaporated Nb film on a MgO substrate or a sapphire substrate by photolithography. The groove-shaped patterns with two kind of spacing of 2μm and 4μm were introduced by etching on a 0.9 × 0.9mm region of the Nb film. Nb films with varying groove depths were prepared, and the groove depth dependence on critical current density was investigated for the width of the hysteresis curve of the magnetic moment. The hysteresis curves of the specimens with grooves were measured with a SQUID magnetometer. The width of the hysteresis curve decreases with an increasing groove depth for over 70% of the film thickness.
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