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Gradiometric micro-SQUID susceptometer for scanning measurements of mesoscopic samples

Rev. Sci. Instrum. 79, 053704 (2008); doi:10.1063/1.2932341

Published 28 May 2008

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Martin E. Huber,1 Nicholas C. Koshnick,2 Hendrik Bluhm,2 Leonard J. Archuleta,1 Tommy Azua,1 Per G. Björnsson,2 Brian W. Gardner,2 Sean T. Halloran,1 Erik A. Lucero,1 and Kathryn A. Moler2
1Department of Physics, University of Colorado Denver, Denver, Colorado 80217-3364, USA
2Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305-4045, USA
We have fabricated and characterized micro-SQUID susceptometers for use in low-temperature scanning probe microscopy systems. The design features the following: a 4.6  µm diameter pickup loop; an integrated field coil to apply a local field to the sample; an additional counterwound pickup-loop/field-coil pair to cancel the background signal from the applied field in the absence of the sample; modulation coils to allow setting the SQUID at its optimum bias point (independent of the applied field), and shielding and symmetry that minimizes coupling of magnetic fields into the leads and body of the SQUID. We use a SQUID series array preamplifier to obtain a system bandwidth of 1  MHz. The flux noise at 125  mK is approximately 0.25µPhi0/sqrt(Hz) above 10  kHz, with a value of 2.5µPhi0/sqrt(Hz) at 10  Hz. The nominal sensitivity to electron spins located at the center of the pickup loop is approximately 200µB/sqrt(Hz) above 10  kHz, in the white-noise frequency region. ©2008 American Institute of Physics
History: Received 19 February 2008; accepted 29 April 2008; published 28 May 2008
Permalink: http://link.aip.org/link/?RSINAK/79/053704/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.25.Dq
    Superconducting quantum interference devices (SQUIDs)
  • 07.55.Jg
    Magnetometers for susceptibility, magnetic moment, and magnetization measurements
  • 04.80.Nn
    Gravitational wave detectors and experiments
  • 84.30.Le
    Amplifiers (electronic circuits)
  • 84.71.Ba
    Superconducting magnets; magnetic levitation devices
  • 85.25.Cp
    Josephson devices
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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REFERENCES (29)
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