Scanning SQUID microscopy in a cryogen-free cooler

Yishai Shperber; Naor Vardi; Eylon Persky; Shai Wissberg; Martin E. Huber; Beena Kalisky

doi:10.1063/1.5087060

Scanning SQUID microscopy in a cryogen-free cooler

Yishai Shperber, Naor Vardi, Eylon Persky, Shai Wissberg, Martin E. Huber, Beena Kalisky

Department of Physics

University of Colorado Denver

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Scanning superconducting quantum interference device (SQUID) microscopy is a powerful tool for investigating electronic states at surfaces and interfaces by mapping their magnetic signal. SQUID operation requires cryogenic temperatures, which are typically achieved by immersing the cryostat in liquid helium. Making a transition to cryogen free systems is desirable, but has been challenging, as electric noise and vibrations are increased in such systems. We report on the successful operation of a scanning SQUID microscope in a modified Montana Instruments cryogen-free cooler with a base temperature of 4.3 K. We demonstrate scanning SQUID measurements with flux noise performance comparable to a wet system and correlate the sensor-sample vibrations to the cryocooler operation frequencies. In addition, we demonstrate successful operation in a variety of SQUID operation modes, including mapping static magnetic fields, measurement of local susceptibility, and spatial mapping of current flow distribution.

Original language	English
Article number	053702
Journal	Review of Scientific Instruments
Volume	90
Issue number	5
DOIs	https://doi.org/10.1063/1.5087060
State	Published - 1 May 2019

Bibliographical note

Publisher Copyright:
© 2019 Author(s).

Funding

We thank Kerry Neal, Caleb Schreibeis, and Brian Smithgall from Montana Instruments and Ilya Sochnikov from UCONN for fruitful discussions. We thank Y. Abulafia for assistance with the measurements and analysis. We thank A. Sharoni for providing NbN films and H. Y. Hwang for LAO/STO samples. This research was supported by the European Research Council Grant No. ERC-2014-STG-639792, the Israeli Science Foundation Grant No. ISF-1281/17, COST Action CA16218, and the QuantERA ERA-NET Cofund in Quantum Technologies (Project No. 731473).

Funders	Funder number
Israeli Science Foundation	ISF-1281/17
Horizon 2020 Framework Programme
European Commission	639792
European Cooperation in Science and Technology	731473, CA16218

Access to Document

10.1063/1.5087060

Cite this

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Scanning SQUID microscopy in a cryogen-free cooler

Abstract

Bibliographical note

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Superconducting Quantum Interference Device (SQUID)

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Scanning SQUID microscopy in a cryogen-free cooler

Abstract

Bibliographical note

Funding

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Equipment

Superconducting Quantum Interference Device (SQUID)

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