A Directly Coupled Superconducting Quantum Interference Device Magnetometer Fabricated in Magnesium Diboride by Focused Ion Beam
G.Burnell (1), D.-J. Kang (1), D. A. Ansell (1), H.-N. Lee (2), S.-H., Moon (2), E. J. Tarte (1), M. G. Blamire (1) ((1) IRC in Superconductivity, University of Cambridge, (2) LG Electronics Institute of Technology)
TL;DR
This paper reports the fabrication and characterization of a MgB2-based SQUID magnetometer using focused ion beam technology, demonstrating high voltage modulation, operational temperature range, and low magnetic flux noise.
Contribution
It introduces a novel directly coupled MgB2 SQUID fabricated with FIB, achieving significant voltage modulation and low flux noise, advancing superconducting magnetometer technology.
Findings
Voltage modulation of 175 mV at 10 K
Operational temperature range from 10 K to 24 K
Magnetic flux noise as low as 14 micro Phi-0/Hz^0.5 at 20 K
Abstract
We report the fabrication of a directly coupled superconducting quantum interference device (SQUID) magnetometer in MgB2 using a focused ion beam (FIB) to create Josephson junctions in a 70 nm thick film of MgB2. The SQUID shows a voltage modulation (deltaV) of 175 mV at a temperature of 10 K and operates over a temperature range from 10 K to 24 K. We find excellent agreement between the measured maximum transfer functions and those predicted by theory. We have measured the magnetic flux noise at 20 K to be as low as 14 micro Phi-0 per root Hz.
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