High sensitivity double relaxation oscillation superconducting quantum interference devices

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

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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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interference
oscillations
sensitivity
leveling
inductance
readout
electric potential
energy

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Adelerhof, Derk Jan ; Kawai, Jun ; Uehara, Gen ; Kado, Hisashi. / High sensitivity double relaxation oscillation superconducting quantum interference devices. In: Applied physics letters. 1994 ; Vol. 65, No. 20. pp. 2606-2608.
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High sensitivity double relaxation oscillation superconducting quantum interference devices. / Adelerhof, Derk Jan; Kawai, Jun; Uehara, Gen; Kado, Hisashi.

In: Applied physics letters, Vol. 65, No. 20, 1994, p. 2606-2608.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Adelerhof, Derk Jan

AU - Kawai, Jun

AU - Uehara, Gen

AU - Kado, Hisashi

PY - 1994

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N2 - 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.

AB - 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.

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DO - 10.1063/1.112582

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JO - Applied physics letters

JF - Applied physics letters

SN - 0003-6951

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