High resolution magnetic microscopy using a DC SQUID

Author

Mathai, A. ; Song, D. ; Gim, Y. ; Wellstood, F.C.

Author_Institution

Dept. of Phys., Maryland Univ., College Park, MD, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2609

Lastpage

2612

Abstract

Using a 4.2 K Nb-PbIn DC superconducting quantum interference device (SQUID) with a 60- mu m inner hole side length, the authors 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 mu m, and the output from the SQUID is recorded as a function of the sample position. The system achieves a spatial resolution of about 66 mu m and a magnetic field resolution of about 5.2 pTHz/sup -1/2/ at a frequency of 6 kHz. The microscope has been used to obtain susceptibility images of patterned superconducting samples in low fields, and a simple method for measuring static magnetic fields has been devised.<>

Keywords

SQUIDs; magnetic field measurement; microscopes; microscopy; 1D magnetic flux microscope; 4.2 K; 6 kHz; DC SQUID; Nb-PbIn; imaging; magnetic field resolution; magnetic flux microscope; patterned superconducting samples; static magnetic field measurement; superconducting quantum interference device; susceptibility images; High-resolution imaging; Interference; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetic force microscopy; Micromagnetics; SQUIDs; Spatial resolution; Superconducting devices;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233522

Filename

233522