Hysteresis and intermittency in direct-current superconducting quantum interference device with nanobridges fabricated on a thin membrane

作者：Segev Eran^*; Suchoi Oren; Shtempluck Oleg; Xue Fei; Buks Eyal

来源：Applied Physics Letters, 2011, 98(5): 052504.

DOI：10.1063/1.3549767

This study examined the voltage response of nanobridge-based direct-current superconducting quantum interference devices (dc-SQUIDs) fabricated on a Si3N4 membrane. Such a configuration may help in reducing 1/f noise, which possibly originates from substrate fluctuating defects. Results showed that the poor thermal coupling between the dc-SQUID and the substrate leads to a strong hysteretic response of the superconducting quantum interference device (SQUID) even though it is biased by an alternating current. In addition, when the dc-SQUID is biased near a threshold of spontaneous oscillations, the measured voltage has an intermittent pattern, which depends on the applied magnetic flux threading the loop of the SQUID.

• 出版日期2011-1-31