Abstract
We show the results obtained from the fabrication and characterisation of MgB2 loops with two nano-bridges as superconducting weak links. These ring structures are made to operate as superconducting quantum interference devices and are investigated as readout system for cryogenics NEMS resonators. The nano-constrictions are fabricated by EBL and ion beam milling. The SQUIDs are characterised at different temperatures and measurements of the noise levels have been performed. The devices show high critical current densities and voltage modulations under applied magnetic field, close to the critical temperatures.
Highlights
The relatively high superconducting critical temperature of magnesium diboride (Tc = 39 K) and its intermetallic properties makes MgB2 a suitable material to fabricate superconductor quantum interference device (SQUID) [1]
In this work we present the results of a first step for realising cryogenic SQUID-nano-electromechanical system (NEMS) combinations
The SQUIDs are based on high quality MgB2 thin films with thickness of 20 nm, grown by hybrid physical-chemical vapour deposition (HPCVD) on SiC substrates
Summary
The relatively high superconducting critical temperature of magnesium diboride (Tc = 39 K) and its intermetallic properties makes MgB2 a suitable material to fabricate superconductor quantum interference device (SQUID) [1]. This was already demonstrated in nano-constriction on grained MgB2 film with stable and reproducible technology [4, 6, 15], it is possible to use MgB2 devices to readout NEMS.
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