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Dependence of HTS rf-SQUID resonant frequency on its slit length (2)

Yuji Miyato

The Japan Society of Applied PhysicsJul 17, 20150 citations

Resonant frequency of high Tc rf-SQUID resonator

Akira Sakai

The Japan Society of Applied PhysicsJul 4, 20130 citations

Robust HTS-SQUID Covered with HTS Film in Flip-Chip Configuration

Yoshimi Hatsukade, Keisuke Yoshida, 孝浩鹿毛 +2 more

IEICE Technical Report; IEICE Tech. Rep.Jan 16, 20140 citations

Improved Characteristics of Integrated HTS rf SQUID on Bicrystal SrTiO3 Substrate Resonator Covered with HTS Thin Films in Flip-Chip Geometry

Yoshimi Hatsukade, Makoto TAKEMOTO, Ryuichi Kurosawa +2 more

Integrated high-temperature superconductor (HTS) radio-frequency (rf) superconducting quantum interference devices (SQUIDs) based on a bicrystal SrTiO3 substrate was investigated for application to magnetic contaminant detection. By covering a wide superconducting weak link and/or a slit of the YBa2Cu3O7-x SQUID with HTS thin films in flip-chip geometry, characteristics such as effective area and 1/f noise profile of the SQUID were successfully improved. By installing the covered SQUID in a magnetic contaminant detection system, it was demonstrated that the system can detect a tungsten ball of 15μm in diameter with a signal to noise ratio of about 2.Integrated high-temperature superconductor (HTS) radio-frequency (rf) superconducting quantum interference devices (SQUIDs) based on a bicrystal SrTiO3 substrate was investigated for application to magnetic contaminant detection. By covering a wide superconducting weak link and/or a slit of the YBa2Cu3O7-x SQUID with HTS thin films in flip-chip geometry, characteristics such as effective area and 1/f noise profile of the SQUID were successfully improved. By installing the covered SQUID in a magnetic contaminant detection system, it was demonstrated that the system can detect a tungsten ball of 15μm in diameter with a signal to noise ratio of about 2.

Physics ProcediaJan 1, 20120 citations

HTS dc SQUID based rf amplifier: development concept

G.V. Prokopenko, S. V. Shitov, I. V. Borisenko +1 more

Physica C SuperconductivityMar 1, 20023 citations

Low Frequency Noise Characteristic in HTS Step-Edge Junction Rf SQUID

S. K. H. Lam, Keith E. Leslie, Jeina Lazar

Rf SQUIDs have been fabricated on MgO substrate using step-edge YBCO junction. Ion beam etching as a post fabrication trimming process is routinely used to reduce (trim) the critical current of the junction for noise optimization. The white noise of SQUIDs with inductance,Ls= 157 pH can be reduced to 55μΦoHz−1/2after the trimming process. However, 1/f noise at low frequency has been found to be degraded after the trimming. Rf SQUIDs withLs= 130 pH were fabricated and measured. A similar noise performance was achieved in these SQUIDs down to 5 Hz without the need of trimming. The 1/f noise was found to be better than that of the trimmed SQUIDs.Rf SQUIDs have been fabricated on MgO substrate using step-edge YBCO junction. Ion beam etching as a post fabrication trimming process is routinely used to reduce (trim) the critical current of the junction for noise optimization. The white noise of SQUIDs with inductance,Ls= 157 pH can be reduced to 55μΦoHz−1/2after the trimming process. However, 1/f noise at low frequency has been found to be degraded after the trimming. Rf SQUIDs withLs= 130 pH were fabricated and measured. A similar noise performance was achieved in these SQUIDs down to 5 Hz without the need of trimming. The 1/f noise was found to be better than that of the trimmed SQUIDs.

IEEE Transactions on Applied SuperconductivityMar 19, 20220 citations

Substrate resonator for HTS rf SQUID operation

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