High sensitivity double relaxation oscillation superconducting quantum interference devices

Derk Jan Adelerhof, Jun Kawai, Gen Uehara, Hisashi Kado

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)
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Abstract

Double relaxation oscillation superconducting quantum interference devices (SQUIDs) (DROSs) have been fabricated with estimated relaxation frequencies up to 14 GHz. Both the intrinsic flux noise and the performance in a flux locked loop with direct voltage readout have been studied. In flux locked loop, a noise level of 0.55 μφ0/√Hz corresponding to an energy sensitivity of 34 h has been obtained for a DROS with a SQUID inductance of 29 pH. The intrinsic sensitivity improves with increasing relaxation frequency, leveling off to a value of 13 h at relaxation frequencies higher than about 3 GHz.
Original languageEnglish
Pages (from-to)2606-2608
Number of pages3
JournalApplied physics letters
Volume65
Issue number20
DOIs
Publication statusPublished - 1994

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