HIGH RESOLUTION MAGNETIC MICROSCOPY USING A dc SQUID

被引：26

作者：

Mathai, A. ^{[1
]}

Song, D. ^{[1
]}

Gim, Y. ^{[1
]}

Wellstood, F. C. ^{[1
]}

机构：

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

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1993年 / 3卷 / 01期

关键词：

D O I：

10.1109/77.233522

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Using a 4.2K Nb-PbIn dc SQUID with a 60 mu m inner hole side length, we have constructed a novel 1-D magnetic flux microscope with an unprecedented combination of spatial and magnetic field resolutions. During imaging, the sample is moved past the SQUID at a separation of about 38 pm and the output from the SQUID is recorded as a function of the sample position. The system achieves a spatial resolution of about 66 pm and a magnetic field resolution of about 5.2 pTHz(-1/2) at a frequency of 6 kHz. We have used the microscope to obtain susceptibility images of patterned superconducting samples in low fields and have devised a simple method for measuring static magnetic fields.

引用

页码：2609 / 2612

页数：4

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