Application of high temperature superconducting thick films to magnetic shielding and valuation of the film

高温超导厚膜在磁屏蔽中的应用及薄膜的评估

• 批准号: 03452187
• 负责人: MINEMOTO Takumi
• 金额: $ 2.88万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452187/
• 关键词: high temperature superconductor; thick film of high Tc superconductor; magnetic shielding; YBCO superconductor; Meissner effect; magnetic force microscope; 磁気シ-ルド; 磁気トラップ; マイスナ-効果

The following results have been obtained in this research.(1) By the addition of a suitable amount of silver (7 wt %), the zero-resistance temperature of Y-Ba-Cu-O (YBCO) increased by 3 K and its critical current density became 9 times larger than that of YBCO without Ag.(2) A magnetic force sensing system using a highly sensitive force sensor has been developed to measure two dimensional distribution of the Meissner effect. Using this system, it was founded that uniformity of superconductivity in a superconductor is affected strongly by the distribution of its components.(3) The maximum shielded magnetic flux densities of cylinders made with bulk YBCO were about several tens Gauss. But the maximum shielded flux density was increased successfully to 400 G by imposing a cylinder made with some chiep ferro-magnetic material over the YBCO cylinder.(4) We succeeded in oxidizing a Cu cylinder surface in a state of thin film and molding a superconducting YBCO thick film on the cylinder surface.(5) The maximum shielded magnetic flux density of a thick film YBCO cylinder made as a trial was 30 mG because the YBCO film was porous. The magnetic shielding effect of thick YBCO films will be improved by making the film with higher YBCO density.

本研究取得了以下成果。(1)通过添加适量的银（7wt%），Y-Ba-Cu-O（YBCO）的零电阻温度提高了3 K，其临界电流密度是未添加银的YBCO的9倍。(2)研制了一种利用高灵敏度力传感器测量迈斯纳效应二维分布的磁力传感系统。利用该系统，发现超导体中超导性的均匀性强烈地受其组分分布的影响。(3)用YBCO块材制成的圆柱体的最大屏蔽磁通密度约为几十高斯。但在YBCO圆柱体上加一个用几种铁磁材料制成的圆柱体，成功地将最大屏蔽磁通密度提高到400 G。(4)我们成功地在薄膜状态下氧化Cu圆柱体表面，并在圆柱体表面上形成超导YBCO厚膜。(5)由于YBCO膜是多孔的，所以作为试验制作的厚膜YBCO圆筒的最大屏蔽磁通密度为30 mG。提高YBCO厚膜的致密度有利于提高YBCO厚膜的磁屏蔽效果。

项目成果

M.Itoh,T.Ohyama,T.Minemoto,K.Numata,K.Hoshino: "The improvement in magnetic shielding by use of a double cylinder configuration of high Tc oxide superconductors" Physics D. 25. 1630-1634 (1992)

M.Itoh、T.Ohyama、T.Minemoto、K.Numata、K.Hoshino：“通过使用高 Tc 氧化物超导体的双圆柱配置来改善磁屏蔽” 物理 D. 25. 1630-1634 (1992)

H.Ishigaki,M.Itoh,A.Hida,K.Iwata: "New measuring system for the distribution of a magnetic force by using an optical fiber" Rev.Sci.Instrum.64. (1993)

H.Ishigaki、M.Itoh、A.Hida、K.Iwata：“使用光纤测量磁力分布的新系统”Rev.Sci.Instrum.64。

T.Ohyama,M.Ishidoh,M.Itoh: "Fundamental characteristics of differential transfomer type displacement sensor using a YBCO superconductor" IEEE Trans.J.Manetics in Japan. 7. 539-544 (1992)

T.Ohyama、M.Ishidoh、M.Itoh：“使用 YBCO 超导体的差动变压器型位移传感器的基本特性”日本 IEEE Trans.J.Manetics。

H.Ishigaki,M.Itoh,A.Hida,H.Endo,T.Ohyama,T.Minemoto: "Measurement of repulsive force of high Tc materials due to Meissner effect and its two dimensional distribution" IEEE Trans.Magnetics. 28. 2427-2430 (1991)

H.Ishigaki、M.Itoh、A.Hida、H.Endo、T.Ohyama、T.Minemoto：“由于迈斯纳效应及其二维分布而测量高 Tc 材料的排斥力”IEEE Trans.Magnetics。

T.Ohyama and M.Itoh: "Construction of a displacement sensor using a superconducting YBCO cylinder" IEEE Trans. Magnetics. 28. 837-841 (1992)

T.Ohyama 和 M.Itoh：“使用超导 YBCO 圆柱体构建位移传感器”IEEE Trans。