メゾスコピック走査ホールプローブ顕微鏡の開発-極微小領域における不均質磁束密度分布の定量解析に向けて-

介观扫描霍尔探针显微镜的开发 - 面向超小区域不均匀磁通密度分布的定量分析 -

• 批准号: 11355026
• 负责人: OSAMURA Kozo
• 金额: $ 22.78万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11355026/
• 关键词: Scanning Mall probe microscope; quantized magnetic flux; Bi2223 tapes; weak link; high Tc superconductor; critical current density; magnetic flux lattice; Yttrium oxide superconductor; Bi2223テープ; 臨界電流密度

1. Observation, of quantised magnetic flux : Using mainly Y123 coated conductor and polycrystalline bulk, we could successfully observed the local magnetic field distribution and the disturbance of magnetic field at and near grain boundary. The magnetic field inhomogeneity with several and several ten micrometers was observed in the Ag/Bi2223 tapes. These results were compared with the small angle neutron scattering intensity and the superconducting property under magnetic field2. Development of conversion program about the current magnetic field distribution : Two type of programs have been developed. (1) Method to get current distribution from the observed magnetic field. For thin film sample, it is possible to get current distribution by using Biot-Savart law. (2) Method to compare the calculated magnetic field distribution with the observed data, where a model current distribution is assumed. Both programs are now used for analyzing the experimental data3. Dynamics of quantized magnetic flux : Dynamical behavior and creep phenomenon of magnetic flux have been investigated based on the data by means of high resolution SHPS and SQUID4. Inhomogeneity of critical current density : Magnetic flux distribution in Ag/Bi2223 tape was measured using high resolution SHPS. The inhomogeneity of the distribution has been discussed to correlate strongly with the local transport current distribution attributing to the inhomogeneity of microstructure

1. 量子化磁通的观察：主要利用Y123涂层导体和多晶体，成功地观察了局部磁场分布和晶界及晶界附近的磁场扰动。在Ag/Bi2223带中观察到几微米和几十微米的磁场不均匀性。这些结果与磁场下的小角中子散射强度和超导性能进行了比较。电流磁场分布转换程序的开发：开发了两种类型的程序。(1)由观测磁场得到电流分布的方法。对于薄膜样品，利用Biot-Savart定律可以得到电流分布。(2)计算磁场分布与观测数据对比的方法，假设模型电流分布。这两个程序现在都用于分析实验数据。量子化磁通量动力学：利用高分辨率SHPS和SQUID4对磁通量的动力学行为和蠕变现象进行了研究。临界电流密度的不均匀性：采用高分辨率SHPS测量了Ag/Bi2223磁带中的磁通量分布。讨论了分布的不均匀性与微观结构的不均匀性引起的局部输运电流分布密切相关

项目成果

T.Horita, K.Osamura, 他: "Microstructure Dependence of Transport Characteristics of Ag/Bi2223 Tapes under Applying DC and AC Currents"Adv.Cryogen.Eng.. 46. 777-784 (2000)

T.Horita、K.Osamura 等人：“施加 DC 和 AC 电流下 Ag/Bi2223 胶带传输特性的微观结构依赖性”Adv.Cryogen.Eng.. 46. 777-784 (2000)

Kozo Osamura 他: "Phaseseparation and Magnetie Flux Pinning in Nd123"Proc. Inter. Conf. And Solid-Solid Phase Transformation. JIMIC-3. 1369-1372 (1999)

Kozo Osamura 等人：“Nd123 中的相分离和磁通量固定”Proc。 JIMIC-3 (1999)。

K.Osamura 他: "Weak Link Path Model and E-J Characteristics in Ag/Bi2223 Tapes"Physica C. 335. 65-68 (2000)

K.Osamura 等人：“Ag/Bi2223 Tapes 中的弱连接路径模型和 E-J 特性”Physica C. 335. 65-68 (2000)

K.Osamura: "Weak Link Path Model and E-J Characteristics in Ag/Bi2223 Tapes"Physica C. 65-68 (2000)

K.Osamura：“Ag/Bi2223 磁带中的弱连接路径模型和 E-J 特性”Physica C. 65-68 (2000)

A.Thamizbavel 他: "Remanent Magnetic Field Distribution in Ab/Bi2223 Tape"Adv.Supercond.. 12. 673-675 (2000)

A.Thamizbavel 等人：“Ab/Bi2223 Tape 中的残余磁场分布”Adv.Supercond.. 12. 673-675 (2000)