Noise properties of dc-SQUID with quasiplanar YBa2Cu3O7 Josephson junctions

M.I. Faley; U. Poppe; K. Urban; H. Hilgenkamp; H. Hemmes; W. Aarnink; J. Flokstra; H. Rogalla

doi:10.1063/1.115087

Noise properties of dc-SQUID with quasiplanar YBa2Cu3O7 Josephson junctions

M.I. Faley, U. Poppe, K. Urban, H. Hilgenkamp, H. Hemmes, W. Aarnink, J. Flokstra, H. Rogalla

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Abstract

We describe the noise performance of dc SQUIDs fabricated with quasiplanar ramp‐type Josephson junctions on the basis of c‐axis‐oriented YBa2Cu3O7/PrBa2Cu3O7 thin‐film heterostructures. The noise spectrum of the dc SQUIDs was measured with dc‐ and ac‐bias schemes at different temperatures and showed values below 10−5 Φ0/Hz1/2 down to frequencies of about 1 Hz at 70 K. Up to now for the magnetic fluxnoise and the energy resolution obtained at 1 kHz and 77 K the best values were 2.5×10−6, Φ0/Hz1/2 and 3×10−31 J/Hz, respectively. A study of the white and 1/fnoises of the SQUIDs was performed. The influence of magnetic flux, bias current, high static magnetic fields, and aging on the SQUID noise were investigated. The junctions and devices do not degrade due to aging in air or thermal cycling.

Original language	English
Pages (from-to)	2087-2089
Number of pages	3
Journal	Applied physics letters
Volume	67
Issue number	14
DOIs	https://doi.org/10.1063/1.115087
Publication status	Published - 1995

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title = "Noise properties of dc-SQUID with quasiplanar YBa2Cu3O7 Josephson junctions",

abstract = "We describe the noise performance of dc SQUIDs fabricated with quasiplanar ramp‐type Josephson junctions on the basis of c‐axis‐oriented YBa2Cu3O7/PrBa2Cu3O7 thin‐film heterostructures. The noise spectrum of the dc SQUIDs was measured with dc‐ and ac‐bias schemes at different temperatures and showed values below 10−5 Φ0/Hz1/2 down to frequencies of about 1 Hz at 70 K. Up to now for the magnetic fluxnoise and the energy resolution obtained at 1 kHz and 77 K the best values were 2.5×10−6, Φ0/Hz1/2 and 3×10−31 J/Hz, respectively. A study of the white and 1/fnoises of the SQUIDs was performed. The influence of magnetic flux, bias current, high static magnetic fields, and aging on the SQUID noise were investigated. The junctions and devices do not degrade due to aging in air or thermal cycling.",

author = "M.I. Faley and U. Poppe and K. Urban and H. Hilgenkamp and H. Hemmes and W. Aarnink and J. Flokstra and H. Rogalla",

year = "1995",

doi = "10.1063/1.115087",

language = "English",

volume = "67",

pages = "2087--2089",

journal = "Applied physics letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "14",

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TY - JOUR

T1 - Noise properties of dc-SQUID with quasiplanar YBa2Cu3O7 Josephson junctions

AU - Faley, M.I.

AU - Poppe, U.

AU - Urban, K.

AU - Hilgenkamp, H.

AU - Hemmes, H.

AU - Aarnink, W.

AU - Flokstra, J.

AU - Rogalla, H.

PY - 1995

Y1 - 1995

N2 - We describe the noise performance of dc SQUIDs fabricated with quasiplanar ramp‐type Josephson junctions on the basis of c‐axis‐oriented YBa2Cu3O7/PrBa2Cu3O7 thin‐film heterostructures. The noise spectrum of the dc SQUIDs was measured with dc‐ and ac‐bias schemes at different temperatures and showed values below 10−5 Φ0/Hz1/2 down to frequencies of about 1 Hz at 70 K. Up to now for the magnetic fluxnoise and the energy resolution obtained at 1 kHz and 77 K the best values were 2.5×10−6, Φ0/Hz1/2 and 3×10−31 J/Hz, respectively. A study of the white and 1/fnoises of the SQUIDs was performed. The influence of magnetic flux, bias current, high static magnetic fields, and aging on the SQUID noise were investigated. The junctions and devices do not degrade due to aging in air or thermal cycling.

AB - We describe the noise performance of dc SQUIDs fabricated with quasiplanar ramp‐type Josephson junctions on the basis of c‐axis‐oriented YBa2Cu3O7/PrBa2Cu3O7 thin‐film heterostructures. The noise spectrum of the dc SQUIDs was measured with dc‐ and ac‐bias schemes at different temperatures and showed values below 10−5 Φ0/Hz1/2 down to frequencies of about 1 Hz at 70 K. Up to now for the magnetic fluxnoise and the energy resolution obtained at 1 kHz and 77 K the best values were 2.5×10−6, Φ0/Hz1/2 and 3×10−31 J/Hz, respectively. A study of the white and 1/fnoises of the SQUIDs was performed. The influence of magnetic flux, bias current, high static magnetic fields, and aging on the SQUID noise were investigated. The junctions and devices do not degrade due to aging in air or thermal cycling.

U2 - 10.1063/1.115087

DO - 10.1063/1.115087

M3 - Article

VL - 67

SP - 2087

EP - 2089

JO - Applied physics letters

JF - Applied physics letters

SN - 0003-6951

IS - 14

ER -

Noise properties of dc-SQUID with quasiplanar YBa2Cu3O7 Josephson junctions

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