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.

本研究的目的是研究超导集成电路中磁通俘获的机理，并开发消除磁通俘获的有效方法。我们按照最初的计划进行了一系列的研究，成功地达到了目的。获得的结果如下：1）Nb薄膜上约瑟夫森结阵列的制作及俘获磁通空间分布的测量——我们开发了一种用Nb基电极制作高质量约瑟夫森结的技术，并成功实现了50个2）磁通捕获机制的阐明-我们根据实验结果考虑了磁通捕获的可能机制。研究表明，磁通钉扎有两种机制，即体钉扎和表面钉扎。3）消除磁通俘获的实验-我们通过照射氦氖激光器的光束进行了消除磁通俘获的实验。结果表明，功率为10-100微米W的激光照射可以消除被捕获的通量。4)基于上述方案，我们考虑了消除通量捕获的有用方法。

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。