Investigation of Material Effects With Micro-Sized SQUID Sensors

Micro-sized SQUID sensors have been designed and fabricated in conventional Nb/AlO x /Nb junction technology. Two types are presented here: a microSQUID gradiometer with two small loops, each with a diameter of 3 μm , and an integrated susceptometer having 30 μm or 60 μm circular loops and on-chip f...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.1602004-1602004
Main Authors: Bechstein, S., Kirste, A., Drung, D., Regin, M., Kazakova, O., Gallop, J., Hao, L., Cox, D., Schurig, T.
Format: Article
Language:English
Subjects:
Applied sciences
Design. Technologies. Operation analysis. Testing
Electrical engineering. Electrical power engineering
Electromagnets
Electronics
Exact sciences and technology
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Integrated circuits
Linearity
Magnetic field measurement
Magnetic fields
magnetic susceptibility
Noise
Particle measurements
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensors
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
SQUIDs
superconducting coils
superconducting device noise
Superconducting devices
superconducting integrated circuits
Temperature measurement
Various equipment and components
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Micro-sized SQUID sensors have been designed and fabricated in conventional Nb/AlO x /Nb junction technology. Two types are presented here: a microSQUID gradiometer with two small loops, each with a diameter of 3 μm , and an integrated susceptometer having 30 μm or 60 μm circular loops and on-chip field coils. Both sensor types have been read out by a SQUID array, acting as a low-noise preamplifier. The microSQUIDs were operated in a temperature range of 4.2 K to 7 K, whereas the susceptometers are rather intended for operation below 4.2 K. Important SQUID parameters such as flux noise, maximum operation field, and nonlinearity were measured at different temperatures. The best white flux noise level achieved with a microSQUID was 135 nΦ 0 /Hz 1/2 at 4.2 K. Micro-sized magnetic beads were investigated with microSQUIDs, whereas susceptometers were used to measure the susceptibility of thin wires up to 100 kHz.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2012.2235505