Magnetic flux noise in thin-film rings of YBa2Cu3O7-δ

Ferrari, M. J.; Johnson, Mark; Wellstood, Frederick C.; Clarke, John; Rosenthal, P. A.; Hammond, R. H.; Beasley, M. R.
August 1988
Applied Physics Letters;8/22/1988, Vol. 53 Issue 8, p695
Academic Journal
The low-frequency magnetic flux noise in thin-film rings of YBa2Cu3O7-δ (YBCO) is measured over the temperature range 1.3–125 K by means of a dc superconducting quantum interference device (SQUID) maintained at liquid-helium temperatures. Below the transition temperature Tc of the YBCO, the spectral density of the noise scales as 1/f, where f is the frequency, and generally increases with increasing temperature. The magnitude of the noise depends strongly on the microstructure of the film, and is lowest for a sample which is predominantly oriented with its c axis perpendicular to the substrate. These results imply that SQUID’s and flux transformers of YBCO must be fabricated from highly oriented films to produce good resolution at low frequencies.


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