High-Tc rf SQUIDs for operation in magnetic fields. Effect of thermal fluctuations

V. I. Shnyrkov; V. P. Timofeev; A. S. Garbuz; Cheol Gi Kim

doi:10.1063/1.593826

High-T_c rf SQUIDs for operation in magnetic fields. Effect of thermal fluctuations

V. I. Shnyrkov, V. P. Timofeev, A. S. Garbuz, Cheol Gi Kim

Department of Physics and Chemistry

NASU - B. Verkin Institute for Low Temperature Physics and Engineering

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

1 Scopus citations

Abstract

Optimization of bulk high-T_c rf SQUID characteristics is carried out in the limit of strong thermal fluctuations. It is shown that such fluctuations affect the impedance of interferometers so that they operate only in quasi-nonhysteretic mode. Textured ceramics can be used to produce SQUIDs capable of stable operation in unshielded environment and/or in strong magnetic fields (H = 150-200 A/m) with a sensitivity about 2 × 10^-13 T/Hz^1/2. These SQUIDs form the basis of a portable susceptometer designed and tested in constant (up to 150 A/m) and varying (up to 4 A/m) magnetic fields with a magnetic moment sensitivity not lower than 1.6 × 10^-10 A·m².

Original language	English
Pages (from-to)	826-828
Number of pages	3
Journal	Low Temperature Physics
Volume	25
Issue number	10
DOIs	https://doi.org/10.1063/1.593826
State	Published - 1999

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abstract = "Optimization of bulk high-Tc rf SQUID characteristics is carried out in the limit of strong thermal fluctuations. It is shown that such fluctuations affect the impedance of interferometers so that they operate only in quasi-nonhysteretic mode. Textured ceramics can be used to produce SQUIDs capable of stable operation in unshielded environment and/or in strong magnetic fields (H = 150-200 A/m) with a sensitivity about 2 × 10-13 T/Hz1/2. These SQUIDs form the basis of a portable susceptometer designed and tested in constant (up to 150 A/m) and varying (up to 4 A/m) magnetic fields with a magnetic moment sensitivity not lower than 1.6 × 10-10 A·m2.",

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AU - Kim, Cheol Gi

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AB - Optimization of bulk high-Tc rf SQUID characteristics is carried out in the limit of strong thermal fluctuations. It is shown that such fluctuations affect the impedance of interferometers so that they operate only in quasi-nonhysteretic mode. Textured ceramics can be used to produce SQUIDs capable of stable operation in unshielded environment and/or in strong magnetic fields (H = 150-200 A/m) with a sensitivity about 2 × 10-13 T/Hz1/2. These SQUIDs form the basis of a portable susceptometer designed and tested in constant (up to 150 A/m) and varying (up to 4 A/m) magnetic fields with a magnetic moment sensitivity not lower than 1.6 × 10-10 A·m2.

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High-T_c rf SQUIDs for operation in magnetic fields. Effect of thermal fluctuations

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