YBCO SQUIDs fabricated by field-emission electron beam source

S. J. Kim; J. Chen; Y. Mizugaki; K. Nakajima; T. Yamashita

doi:10.1109/77.783682

YBCO SQUIDs fabricated by field-emission electron beam source

S. J. Kim, J. Chen, Y. Mizugaki, K. Nakajima, T. Yamashita

Research Institute of Electrical Communication (RIEC)

Research output: Contribution to journal › Article › peer-review

Abstract

We report the applicability of YBa ₂Cu ₃O _7-y (YBCO) SQUIDs fabricated by field-emission electron beam source. The junctions show hysteresis and self-resonance steps related to a high frequency resonance in the dc SQUID loop at a voltage V _res = φ ₂ / 2π(LC / 2) ^1/2 around 0.3 T _c. The noise spectrum of the SQUIDs was measured with de-bias schemes at different temperatures and showed values around 10 ^-4 φ ₀/Hz ^1/2 down to frequencies of 10 Hz at 40 K. The influence of magnetic flux, operating temperatures and flux-voltage transfer factor (|dV/d<SJ ) were investigated. We also tested inverter operation of a de-biased Josephson logic gate composed of an rf SQUID and a dc SQUID to realize logic circuit performance. Operation of the inverter has been successfully demonstrated although the operating temperature is low, around 10 K.

Original language	English
Pages (from-to)	3089-3092
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	9
Issue number	2 PART 3
DOIs	https://doi.org/10.1109/77.783682
Publication status	Published - 1999

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "YBCO SQUIDs fabricated by field-emission electron beam source",

abstract = "We report the applicability of YBa 2Cu 3O 7-y (YBCO) SQUIDs fabricated by field-emission electron beam source. The junctions show hysteresis and self-resonance steps related to a high frequency resonance in the dc SQUID loop at a voltage V res = φ 2 / 2π(LC / 2) 1/2 around 0.3 T c. The noise spectrum of the SQUIDs was measured with de-bias schemes at different temperatures and showed values around 10 -4 φ 0/Hz 1/2 down to frequencies of 10 Hz at 40 K. The influence of magnetic flux, operating temperatures and flux-voltage transfer factor (|dV/d<SJ ) were investigated. We also tested inverter operation of a de-biased Josephson logic gate composed of an rf SQUID and a dc SQUID to realize logic circuit performance. Operation of the inverter has been successfully demonstrated although the operating temperature is low, around 10 K.",

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AU - Kim, S. J.

AU - Chen, J.

AU - Mizugaki, Y.

AU - Nakajima, K.

AU - Yamashita, T.

PY - 1999

Y1 - 1999

N2 - We report the applicability of YBa 2Cu 3O 7-y (YBCO) SQUIDs fabricated by field-emission electron beam source. The junctions show hysteresis and self-resonance steps related to a high frequency resonance in the dc SQUID loop at a voltage V res = φ 2 / 2π(LC / 2) 1/2 around 0.3 T c. The noise spectrum of the SQUIDs was measured with de-bias schemes at different temperatures and showed values around 10 -4 φ 0/Hz 1/2 down to frequencies of 10 Hz at 40 K. The influence of magnetic flux, operating temperatures and flux-voltage transfer factor (|dV/d<SJ ) were investigated. We also tested inverter operation of a de-biased Josephson logic gate composed of an rf SQUID and a dc SQUID to realize logic circuit performance. Operation of the inverter has been successfully demonstrated although the operating temperature is low, around 10 K.

AB - We report the applicability of YBa 2Cu 3O 7-y (YBCO) SQUIDs fabricated by field-emission electron beam source. The junctions show hysteresis and self-resonance steps related to a high frequency resonance in the dc SQUID loop at a voltage V res = φ 2 / 2π(LC / 2) 1/2 around 0.3 T c. The noise spectrum of the SQUIDs was measured with de-bias schemes at different temperatures and showed values around 10 -4 φ 0/Hz 1/2 down to frequencies of 10 Hz at 40 K. The influence of magnetic flux, operating temperatures and flux-voltage transfer factor (|dV/d<SJ ) were investigated. We also tested inverter operation of a de-biased Josephson logic gate composed of an rf SQUID and a dc SQUID to realize logic circuit performance. Operation of the inverter has been successfully demonstrated although the operating temperature is low, around 10 K.

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YBCO SQUIDs fabricated by field-emission electron beam source

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