Title :
Temperature dependence performances of fully integrated DC SQUID magnetometers
Author :
Granata, Carmine ; Monaco, Antonia ; Di Russo, C. ; Lissitski, Mikhail P. ; Russo, Cosmo Di
Author_Institution :
Ist. di Cibernetica E. Caianiello, Consiglio Nazionale delle Ricerche, Pozzuoli, Italy
Abstract :
Temperature dependence of the main characteristics of integrated dc superconducting quantum interference device magnetometers based on niobium technology including an additional positive feedback circuit is reported. Temperatures above 4.2 K have been considered. A nonlinear temperature dependence of the spectral density of the field noise has been observed. The reported measurements show a slow increasing of the field noise up to temperatures of about 5 K, giving a considerable tolerance of the working temperature of niobium magnetometers in some innovative multichannel systems for magnetoencephalography.
Keywords :
SQUID magnetometers; biomedical equipment; circuit feedback; frequency locked loops; magnetic noise; magnetoencephalography; superconducting device noise; 4.2 to 5 K; DC SQUID magnetometers; field noise; fully integrated magnetometers; magnetoencephalography; multichannel systems; mutual inductance; nonlinear temperature dependence; positive feedback circuit; readout electronics; spectral density; Feedback circuits; Integrated circuit technology; Interference; Magnetic field measurement; Niobium; Noise measurement; SQUID magnetometers; Superconducting device noise; Superconducting devices; Temperature dependence;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.816204
