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Journal Articles Journal of Low Temperature Physics Year : 2014

MicroSQUID Force microscopy in a dilution refrigerator

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.
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Dates and versions

hal-00963979 , version 1 (23-03-2014)

Identifiers

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Danny Hykel, Zhao-Sheng Wang, Pauline Castellazzi, Thierry Crozes, Gorky Shaw, et al.. MicroSQUID Force microscopy in a dilution refrigerator. Journal of Low Temperature Physics, 2014, 175 (5), pp.861-867. ⟨10.1007/s10909-014-1174-9⟩. ⟨hal-00963979⟩

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