Title :
SQUID magnetometer noise measurements on YBa2Cu3 O7 thin films and input coils
Author :
DiIorio, M.S. ; Yang, K-Y ; Zhang, J. ; Yoshizumi, S. ; Maung, M.
Author_Institution :
Biomagnetic Technol. Inc., San Diego, CA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
A SQUID magnetometer system incorporating a NB-based conventional SQUID operating at 4.8 K was used to measure the magnetic field noise from high-Tc input coils and unpatterned films at 77 K. The system allows for the rapid measurement of relatively large regions of high-Tc material. The results on numerous coils and films show the noise decreasing as a function of increasing film critical current density at 77 K. High-Tc films with Jc(77 K)=3×106 A/cm2 appear suitable for use as input coils in SQUID magnetometer applications requiring low noise at frequencies down to 1 Hz
Keywords :
SQUIDs; barium compounds; coils; high-temperature superconductors; magnetometers; yttrium compounds; 4.8 K; 77 K; SQUID magnetometer system; film critical current density; high-Tc input coils; high-temperature superconductors; input coils; magnetic field noise; unpatterned films; Coils; Current measurement; Density measurement; Magnetic films; Magnetic materials; Noise generators; Noise measurement; SQUID magnetometers; Superconducting device noise; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
