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$\hat{I}¼$m\textsuperscript{2} and a magnetic flux sensitivity of 120 $\hat{I}¼\hat{I}{¦}_0/\sqrt{\text{Hz}}$ and thus a field sensitivity of %$550^{-6}\hat{I}{¦}_0/\sqrt{\text{Hz}}$ 550$\hat{I}¼\text{G}/\sqrt{\text{Hz}}$. The scan range at low temperatures is about 80 $\hat{I}¼$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.