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1 NEEL - Institut Néel 2 beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science 3 Nanofab - Nanofab NEEL - Institut Néel 4 MagSup - Magnétisme et Supraconductivité NEEL - Institut Néel 5 IRAM - Institut de RadioAstronomie Millimétrique

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$ \ \mu$m\textsuperscript{2} and a magnetic flux sensitivity of 120 $\mu\Phi {0} - \sqrt{\textrm{Hz}}$ and thus a field sensitivity of %$550^{-6} \ \Phi {0} - \sqrt{\textrm{Hz}}$ 550$ \ \mu \textrm{G}- \sqrt{\textrm{Hz}}$.
The scan range at low temperatures is about 80 $\mu$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.


keyword : Superconductivity Scanning Microscopy SQUID





Author: Danny Hykel - Zhao-Sheng Wang - Pauline Castellazzi - Thierry Crozes - Gorky Shaw - Klaus Hasselbach - K.
F.
Schuster -


Source: https://hal.archives-ouvertes.fr/



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