Low-frequency noise of high Tc superconducting quantum interference device (SQUID) magnetometer fabricated on bicrystal substrate

被引：6

作者：

Minotani, T ^{[1
]}

Hotta, M ^{[1
]}

Enpuku, K ^{[1
]}

机构：

[1] Kyushu Univ, Dept Elect, Higashi Ku, Fukuoka 8128581, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2000年 / 39卷 / 5A期

关键词：

high T-c SQUID; magnetometer; low frequency noise; flux trapping; grain boundary; bicrystal substrate;

D O I：

10.1143/JJAP.39.L402

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The excess low-frequency noise of a high T-c superconducting quantum interference device (SQUID) magnetometer fabricated on bicrystal substrate is studied. Direct-coupled magnetometers are fabricated using different geometrics 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.

引用

页码：L402 / L405

页数：4

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