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Title: Cryogen-free variable temperature scanning SQUID microscope

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 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 YBCO above 90 K.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Applied Physics
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Applied Physics
  3. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Applied Physics; Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1529170
Alternate Identifier(s):
OSTI ID: 1523846
Grant/Contract Number:  
AC02-76SF00515; AC02- 76SF00515
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 6; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Bishop-Van Horn, Logan, Cui, Zheng, Kirtley, John R., and Moler, Kathryn A. Cryogen-free variable temperature scanning SQUID microscope. United States: N. p., 2019. Web. doi:10.1063/1.5085008.
Bishop-Van Horn, Logan, Cui, Zheng, Kirtley, John R., & Moler, Kathryn A. Cryogen-free variable temperature scanning SQUID microscope. United States. doi:10.1063/1.5085008.
Bishop-Van Horn, Logan, Cui, Zheng, Kirtley, John R., and Moler, Kathryn A. Sat . "Cryogen-free variable temperature scanning SQUID microscope". United States. doi:10.1063/1.5085008.
@article{osti_1529170,
title = {Cryogen-free variable temperature scanning SQUID microscope},
author = {Bishop-Van Horn, Logan and Cui, Zheng and Kirtley, John R. and Moler, Kathryn A.},
abstractNote = {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 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 YBCO above 90 K.},
doi = {10.1063/1.5085008},
journal = {Review of Scientific Instruments},
number = 6,
volume = 90,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1063/1.5085008

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Works referenced in this record:

Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
journal, September 2011

  • Bert, Julie A.; Kalisky, Beena; Bell, Christopher
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