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ST457 - A SQUID Microscope Using a Hollow-Structured Cryostat for Scanning Room-Temperature Rock Samples

A SQUID Microscope Using a Hollow-Structured Cryostat for Scanning Room-Temperature Rock Samples
 
J. Kawai1, M. Miyamoto1, H. Ogata1, H. Oda2, I. Miyagi2, M. Sato2, J. Fujihira3
 
1Kanazawa Institute of Technology, Kanazawa, Japan
2Geological Survey of Japan, National Institute of Advanced Industrial Science Technology, Tsukuba, Japan
FEDLIC Co. Ltd., Tsukuba, Japan
 
 
Abstract — We developed a high-resolution superconducting quantum interference device (SQUID) microscope, which employs a hollow cryostat, for magnetic field imaging of rock samples at room temperature. A directly coupled low temperature SQUID with a 0.2 x 0.2 mm2 pick-up loop, mounted on a sapphire conical rod, is separated from a sample at room temperature through a vacuum gap and a 40-micrometer-thick sapphire window. Precise and repeatable adjustment of the vacuum gap is performed by rotating a micrometer spindle connected to the sapphire rod through the hollow of the cryostat.  We have achieved the separation of 0.23 mm between the SQUID and a sample. We also demonstrated imaging of the magnetic field of a zircon crystal having magnetite grains.

Keywords (Index Terms) — SQUID microscope, magnetic imaging, geological sample.

IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), July 2015.
Selected August 4, 2015. Reference ST450; Category 4. 
Preprint of invited poster paper SQ-P02-INV presented at ISEC 2015; Nagoya, Japan, July 6 – 9, 2015. 
Final version will be published by IEEE XPLORE.