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Cryogen-free Variable Temperature Scanning SQUID Microscope

Cryogen-free Variable Temperature Scanning SQUID Microscope

Logan Bishop-Van Horn, Zheng Cui, John R Kirtley, Kathryn A Moler

Rev Sci Instrum. 2019 Jun;90(6):063705.

PMID: 31255038

Abstract:

Scanning Superconducting QUantum Interference Device (SQUID) microscopy is a powerful tool for imaging local magnetic properties of materials and devices, but it requires a low-vibration cryogenic environment, traditionally achieved by thermal contact with a bath of liquid helium or the mixing chamber of a "wet" dilution refrigerator. We mount a SQUID microscope on the 3 K plate of a Bluefors cryocooler and characterize its vibration spectrum by measuring SQUID noise in a region of sharp flux gradient. By implementing passive vibration isolation, we reduce relative sensor-sample vibrations to 20 nm in-plane and 15 nm out-of-plane. A variable-temperature sample stage that is thermally isolated from the SQUID sensor enables the measurement at sample temperatures from 2.8 K to 110 K. We demonstrate these advances by imaging inhomogeneous diamagnetic susceptibility and vortex pinning in optimally doped yttrium barium copper oxide above 90 K.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP107539208	Yttrium barium copper oxide		107539-20-8	Price

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