Low-frequency flux noise in YBCO dc SQUIDs cooled in static magnetic fields

被引:2
作者
Sager, MP [1 ]
Petersen, PRE
Holst, T
Shen, YQ
Hansen, JB
机构
[1] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark
[2] Rigshosp, Dept Clin Neurophysiol, DK-2100 Copenhagen, Denmark
[3] NKT Res Ctr, DK-2605 Brondby, Denmark
关键词
D O I
10.1088/0953-2048/12/11/332
中图分类号
O59 [应用物理学];
学科分类号
摘要
The low-frequency flux noise in bicrystal and step-edge YBa2Cu3Ox de SQUIDs has been investigated. The width, w, of the superconducting strips forming the SQUID frame was varied from 4 to 42 mu m. The SQUIDs were cooled in static magnetic fields up to 150 mu T. Two types of low-frequency noise dominated, namely 1/f-like noise and random telegraph noise giving a Lorentzian frequency spectrum. The 1/f noise performance of the w = 4, 6 and 7 mu m SQUIDs was almost identical, while the SQUIDs with w = 22 and 42 mu m showed an order of magnitude higher noise level. Our analysis of the data suggests an exponential increase of the 1/f noise versus the cooling held, exhibiting a characteristic magnetic field around 40 mu T.
引用
收藏
页码:798 / 801
页数:4
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