The Study of High Tc Superconducting Planar First order gradiometer

• Main Authors: Yu-Chien Liu, 劉育杰
• Other Authors: Hong-Er Horng
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/85471585381888972645

碩士 === 國立臺灣師範大學 === 物理研究所 === 88 === In this thesis we fabricated and discussed the performance of high Tc superconducting planar directly coupled first order Gradiometer. The devices were patterned with the standardphotolithography, operated at temperatures up to 77 K. We found the equality of step-edge junctions was determined by the exposure time and the incident angle of Ar+ ion. The step-edge junction consisted with RSJ model. There are two main sources of magnetic flux noise spectrum. One is white noise independent of frequency，the other is 1/f noise proportional to reciprocal of frequency. We checked that the output voltage of gradiometer has linear relation with first order differential of magnetic field. However, the output voltage of gradiometer also depended on the angle between the magnetic gradient direction and baseline. It was found the maximum output voltage of gradiometer could be obtained while the two directions were parallel.