Title :
High sensitivity magnetic flux sensors with direct voltage readout: double relaxation oscillation SQUIDs
Author :
Adelerhof, D.J. ; Van Duuren, M.J. ; Flokstra, J. ; Rogalla, H. ; Kawai, J. ; Kado, H.
Author_Institution :
Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands
fDate :
6/1/1995 12:00:00 AM
Abstract :
The experimental sensitivity of double relaxation oscillation SQUIDs (DROSs) has been compared with theory and with the results obtained by numerical simulations. The experimental sensitivity ranges from 60 to 13h, where h is Planck´s constant, for relaxation frequencies from 0.4 up to 10 GHz. For low frequencies the DROS characteristics can be explained by thermal noise on the critical currents. For high frequencies, the voltage-flux characteristics and the sensitivity are limited by the plasma frequency. The cross-over frequency is at 2 GHz, which is about 2% of the plasma frequency of the DROSs.<>
Keywords :
SQUID magnetometers; critical currents; digital readout; relaxation oscillators; superconducting device noise; thermal noise; 0.4 to 10 GHz; Planck´s constant; critical currents; cross-over frequency; direct voltage readout; double relaxation oscillation SQUID; high frequencies; high sensitivity magnetic flux sensors; low frequencies the DROS; numerical simulations; plasma frequency; relaxation frequencies; sensitivity; thermal noise; voltage-flux characteristics; Critical current; Damping; Frequency; Hysteresis; Magnetic flux; Magnetic sensors; Plasma properties; Resistors; SQUIDs; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
