Study on Flux Trapping in Superconducting Integrated Circuits and Development of a Method for Eliminating Flux Trapping

超导集成电路中磁通陷阱的研究及消除磁通陷阱方法的开发

• 批准号: 60550012
• 负责人: YOSHIDA Keiji
• 金额: $ 1.41万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550012/
• 关键词: Superconducting integrated circuits; 磁束トラップ

The purpose of this research is to study the mechanism of flux trapping in superconducting integrated circuits and to develop an effective method for eliminating the trapped flux. We have conducted a series of study according to the initial plan, and successfully achieved the purpose. The obtained results are as follows:1) Fabrication of Josephson junction arrays on Nb thin film and measurement of spatial distribution of trapped magnetic flux- We have developed a technique for fabricating good-quality Josephson junctions with Nb base electrode, and succeeded in realizing 50 series connected junctions.2) Elucidation of flux-trapping mechanism- We have considered a probable mechanism for the flux trapping based on the experimental results. It has been shown that there are two mechanisms of flux pinning,i.e., bulk pinning and surface pinning.3) Experiment on eliminating flux trapping- We have made an experiment on eliminating the trapped flux by irradiating a light beam from He-Ne laser. It is shown that the trapped flux can be eliminated by the laser irradiation of the power of 10-100<micrn>W.4) We have considered usefull methods for eliminating the flux trapping based on the above scheme.

本研究的目的是探讨超导积体电路中磁通陷阱的产生机制，并发展一种有效的消除磁通陷阱的方法。我们按照最初的计划进行了一系列的研究，并成功地达到了目的。获得的结果如下：1）在Nb薄膜上制作约瑟夫森结阵列和测量俘获磁通的空间分布--我们发展了一种在Nb基电极上制作高质量约瑟夫森结的技术，并成功地实现了50个串联结。2）解释磁通俘获机制--根据实验结果，我们考虑了磁通俘获的可能机制。已经表明，存在两种磁通钉扎机制，即，3）消除磁通陷阱的实验--用He-Ne激光器的光束进行了消除磁通陷阱的实验。结果表明，用功率为10-100 W的激光辐照可以消除磁通<micrn>陷阱。4）在上述方案的基础上，我们考虑了消除磁通陷阱的有效方法。

项目成果

F.Irie: Proc.Int.Conf.on SQUID. 3. 431-460 (1986)

F.Irie：Proc.Int.Conf.on SQUID。

K,Yoshida et al.: "Analog Amplifier with Large Current Gain" IEEE Transations on Magnetics. MAG-23. 723-726 (1987)

K,Yoshida 等人：“具有大电流增益的模拟放大器”IEEE 磁学转换。

T.Kisu et al.: Japanese Journal of Applied Physics. 26. L1348-L1351 (1987)

T.Kisu 等人：日本应用物理学杂志。

K.Yoshida et al.: "Superconductivity Electronics" Ohmsha, 313 (1987)

K.Yoshida 等人：“超导电子学” Ohmsha，313 (1987)

K. Yoshida et al.: "Millimeter Wave Emissicon from Josephson Oscillator through Thin Junction Electrode" IEEE Transactions on Magnetics. MAG-23. 1283-1286 (1987)

K. Yoshida 等人：“约瑟夫森振荡器通过薄结电极的毫米波发射”IEEE 磁学汇刊。