Low-Frequency Noise of High Tc Superconducting Quantum Interference Device (SQUID) Magnetometer Fabricated on Bicrystal Substrate
Low-Frequency Noise of High Tc Superconducting Quantum Interference Device (SQUID) Magnetometer Fabricated on Bicrystal Substrate
复制标题
双晶衬底高温超导量子干涉仪（SQUID）磁力计的低频噪声
DOI：
10.1143/jjap.39.l402
复制
发表时间：
2000
影响因子：
1.5
通讯作者：
K. Enpuku
中科院分区：
文献类型：
--
作者：
T. Minotani;M. Hotta;K. Enpuku
研究了双晶衬底高温超导量子干涉仪（SQUID）磁强计的超低频噪声。采用不同的拾波线圈结构制作了直接耦合磁强计，研究了拾波线圈结构与磁强计低频噪声之间的关系。结果表明，在双晶衬底晶界上自动形成的拾波线圈中的弱超导区是产生超噪声的主要原因之一。通过选择合适的拾取线圈的几何形状，我们可以在不减小其有效面积的情况下显著降低磁强计的过量噪声。
The excess low-frequency noise of a high Tc superconducting quantum interference device (SQUID) magnetometer fabricated on bicrystal substrate is studied. Direct-coupled magnetometers are fabricated using different geometries of the pickup coil, and the relationship between the geometry of the pickup coil and the low-frequency noise of the magnetometer is studied. It is shown that the weak superconducting region in the pickup coil, which is automatically formed on top of the grain boundary of the bicrystal substrate, is one of the main sources of the excess noise. By selecting an appropriate geometry of the pickup coil, we can significantly decrease the excess noise of the magnetometer without decreasing its effective area.