Closed-cycle refrigerator-cooled scanning SQUID microscope for room-temperature samples

被引：21

作者：

Fleet, EF ^{[1
]}

Chatraphorn, S

Wellstood, FC

Knauss, LA

Green, SM

机构：

[1] Univ Maryland, Ctr Superconduct Res, College Pk, MD 20742 USA

[2] Neocera Inc, Beltsville, MD 20705 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2001年 / 72卷 / 08期

关键词：

D O I：

10.1063/1.1384425

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have designed, built, and operated a scanning superconducting quantum interference device (SQUID) microscope that uses a closed-cycle refrigerator to cool a YBa2Cu3O7 (YBCO) dc SQUID to 77 K. The SQUID is mounted in custom vacuum housing that has a thin sapphire window that maintains thermal isolation of the SQUID while allowing samples to be imaged in air at room temperature. Samples are mounted on an x-y scanning table and can be brought to within about 60 mum of the SQUID for magnetic field imaging. The SQUID has an effective pick-up area of 1.2x10(-9) m(2) and a level of flux noise of 10.5 mu Phi (0)/Hz(1/2) in the white noise region (above 500 Hz). We describe the performance of the system and present images of a variety of samples. (C) 2001 American Institute of Physics.

引用

页码：3281 / 3290

页数：10

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