Journal of Low Temperature Physics

, Volume 175, Issue 5, pp 861–867

MicroSQUID Force Microscopy in a Dilution Refrigerator

  • D. J. Hykel
  • Z. S. Wang
  • P. Castellazzi
  • T. Crozes
  • G. Shaw
  • K. Schuster
  • K. Hasselbach
Article

DOI: 10.1007/s10909-014-1174-9

Cite this article as:
Hykel, D.J., Wang, Z.S., Castellazzi, P. et al. J Low Temp Phys (2014) 175: 861. doi:10.1007/s10909-014-1174-9
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Abstract

We present a new generation of a scanning microSQUID microscope operating in an inverted dilution refrigerator. The microSQUIDs have a size of 1.21\( \ \upmu \)m\(^{2}\) and a magnetic flux sensitivity of 120 \(\upmu \Phi _{0} / \sqrt{\text {Hz}}\) and thus a field sensitivity of 550\( \ \upmu \text {G}/ \sqrt{\text {Hz}}\). The scan range at low temperatures is about 80 \(\upmu \)m and a coarse displacement of 5 mm in x and y direction has been implemented. The microSQUID-to-sample distance is regulated using a tuning fork based force detection. A microSQUID-to-sample distance of 420 nm has been obtained. The reliable knowledge of this distance is necessary to obtain a trustworthy estimate of the absolute value of the superconducting penetration depth. An outlook will be given on the ongoing direction of development.

Keywords

SQUIDScanning microscopySuperconductivty

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • D. J. Hykel
    • 1
  • Z. S. Wang
    • 1
    • 2
  • P. Castellazzi
    • 1
  • T. Crozes
    • 1
  • G. Shaw
    • 1
  • K. Schuster
    • 3
  • K. Hasselbach
    • 1
  1. 1.CNRSInstitut Néel, Université Grenoble AlpesGrenobleFrance
  2. 2.Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics, Chinese Academy of ScienceBeijingChina
  3. 3.Institut de Radioastronomie Millimétrique, Domaine UniversitaireSaint Martin d’HèresFrance